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suvat equations

1.) Calculate the final speed of a mass, 5 kg, dropped from a height of 10 m. Assume free fall acceleration g=10 m s-2

2.) Calculate the final speed of a mass, 8 kg, thrown downwards from a height of 1 m and with initial speed 8 ms-1

3.) Calculate the final speed of a mass, 8 kg, thrown upwards from a height of 0.5 m and with initial speed 10.5 ms-1

Hi could somebody explain how to do these questions? I have a list of suvat formulas but im still not sure how to do them.
for 1.) I was going to use v^2 = u^2 + 2as but I dont know what my u is?


Original post by jacksonmeg
1.) Calculate the final speed of a mass, 5 kg, dropped from a height of 10 m. Assume free fall acceleration g=10 m s-2

2.) Calculate the final speed of a mass, 8 kg, thrown downwards from a height of 1 m and with initial speed 8 ms-1

3.) Calculate the final speed of a mass, 8 kg, thrown upwards from a height of 0.5 m and with initial speed 10.5 ms-1

Hi could somebody explain how to do these questions? I have a list of suvat formulas but im still not sure how to do them.
for 1.) I was going to use v^2 = u^2 + 2as but I dont know what my u is?



For question 1 i would assume that the initial velocity is 0.
Reply 2
Avatar for jacksonmeg
jacksonmeg
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Original post by nebelbon
For question 1 i would assume that the initial velocity is 0.

ok thanks

and for 2.)
I have S=1, U=8, V=?
so i think im missing some information
Reply 3
Avatar for lerjj
lerjj
13
Original post by jacksonmeg
ok thanks

and for 2.)
I have S=1, U=8, V=?
so i think im missing some information


you're going to use v^2=u^2+2as again (in fact, for all of these)

You need to work out what a is in this case.
Original post by jacksonmeg
ok thanks

and for 2.)
I have S=1, U=8, V=?
so i think im missing some information


You also know the acceleration due to gravity.
Reply 5
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jacksonmeg
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Original post by nebelbon
You also know the acceleration due to gravity.

I do? e.e
btw I should point out I didnt physics a level this is for my chemistry degree =)
Original post by jacksonmeg
I do? e.e
btw I should point out I didnt physics a level this is for my chemistry degree =)


Yep. It says g=10ms^-2.
Reply 7
Avatar for jacksonmeg
jacksonmeg
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11
Original post by nebelbon
Yep. It says g=10ms^-2.

whats the difference between throwing up and down, is there a change in sign?
Original post by jacksonmeg
whats the difference between throwing up and down, is there a change in sign?


It depends which way you take to be positive and negative.

If it is going down i would say the acceleration is positive.
Reply 9
Avatar for Andy98
Andy98
20
Original post by nebelbon
Yep. It says g=10ms^-2.


It depends, on my course it's 9.81

Original post by jacksonmeg
whats the difference between throwing up and down, is there a change in sign?


Yeah, I generally say the initial direction of travel is the positive direction - so if you throw a ball straight up it will accelerate at -9.81ms^-2
Original post by Andy98
It depends, on my course it's 9.81



Yeah, I generally say the initial direction of travel is the positive direction - so if you throw a ball straight up it will accelerate at -9.81ms^-2


I always used 9.81 as well; but it says in the question to use 10 in this instance.
Reply 11
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Andy98
20
Original post by nebelbon
I always used 9.81 as well; but it says in the question to use 10 in this instance.


Ahhh yes, do forgive my quick scan through

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