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.