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A motor vehicle having a mass of 1.8t is at rest on an incline of 1 in 12 (sine) when the brakes are released. The vehicle travels 30m down the incline against a constant frictional resistance to motion of 200N/t and reaches the bottom of the slope.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

please help.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

please help.

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(Original post by

Increase in KE = Loss in GPE - Work Done by Friction

**swinroy**)Increase in KE = Loss in GPE - Work Done by Friction

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#4

(Original post by

which part of the question is that for and what do I write for part c. hope you can help. thanks.

**raffay13**)which part of the question is that for and what do I write for part c. hope you can help. thanks.

Part b is a method whereby you find the resultant force down the plane then use Newton’s 2 nd law to find acceleration down the plane. Then use SUVAT to find speed

Part c is trying to make the student realise that Energy method only requires ONE equation and takes Less time to calculate

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(Original post by

KE stands for Kinetic Energy so perhaps PART a ?????????

Part b is a method whereby you find the resultant force down the plane then use Newton’s 2 nd law to find acceleration down the plane. Then use SUVAT to find speed

Part c is trying to make the student realise that Energy method only requires ONE equation and takes Less time to calculate

**Swinroy2**)KE stands for Kinetic Energy so perhaps PART a ?????????

Part b is a method whereby you find the resultant force down the plane then use Newton’s 2 nd law to find acceleration down the plane. Then use SUVAT to find speed

Part c is trying to make the student realise that Energy method only requires ONE equation and takes Less time to calculate

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#6

**raffay13**)

which part of the question is that for and what do I write for part c. hope you can help. thanks.

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(Original post by

900 (v- squared) = 1800g30(1/12) - 200(1.8)(30)

**swinroy**)900 (v- squared) = 1800g30(1/12) - 200(1.8)(30)

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#8

(Original post by

which question part is this for

**raffay13**)which question part is this for

Please think it through

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A motor vehicle having a mass of 1.8t is at rest on an incline of 1 in 12 (sine) when the brakes are released. The vehicle travels 30m down the incline against a constant frictional resistance to motion of 200N/t and reaches the bottom of the slope.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

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#10

(Original post by

A motor vehicle having a mass of 1.8t is at rest on an incline of 1 in 12 (sine) when the brakes are released. The vehicle travels 30m down the incline against a constant frictional resistance to motion of 200N/t and reaches the bottom of the slope.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

please help.

**raffay13**)A motor vehicle having a mass of 1.8t is at rest on an incline of 1 in 12 (sine) when the brakes are released. The vehicle travels 30m down the incline against a constant frictional resistance to motion of 200N/t and reaches the bottom of the slope.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

please help.

Tell us what are your difficulties.

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A motor vehicle having a mass of 1.8t is at rest on an incline of 1 in 12 (sine) when the brakes are released. The vehicle travels 30m down the incline against a constant frictional resistance to motion of 200N/t and reaches the bottom of the slope.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

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#12

(Original post by

A motor vehicle having a mass of 1.8t is at rest on an incline of 1 in 12 (sine) when the brakes are released. The vehicle travels 30m down the incline against a constant frictional resistance to motion of 200N/t and reaches the bottom of the slope.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

**raffay13**)A motor vehicle having a mass of 1.8t is at rest on an incline of 1 in 12 (sine) when the brakes are released. The vehicle travels 30m down the incline against a constant frictional resistance to motion of 200N/t and reaches the bottom of the slope.

(a) Using the principle of conservation of energy, calculate the velocity of the vehicle at the bottom of the incline.

(b) Using an alternative method that does not involve a consideration of energy, calculate the velocity of the vehicle at the bottom of the incline.

(c) Discuss the merits of the two methods you have used for parts (a) and (b) of this question. Justify the use of an energy method for these types of problems.

https://www.thestudentroom.co.uk/sho....php?t=6736138

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