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# Mechanics question (pls help)

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1. http://filestore.aqa.org.uk/subjects...2-QP-JUN14.PDF

Can someone please explain how you approach question 1 (c) (ii)?
2. (Original post by jessyjellytot14)
http://filestore.aqa.org.uk/subjects...2-QP-JUN14.PDF

Can someone please explain how you approach question 1 (c) (ii)?
What have you done so far?
What have you done so far?
Nothing because I don't know which equation to use. I have answered the previous parts.
4. (Original post by jessyjellytot14)
Nothing because I don't know which equation to use. I have answered the previous parts.
Think of the energy transfers taking place during the rollercoaster
Think of the energy transfers taking place during the rollercoaster
Ek= 1/2mv2 ?
6. (Original post by jessyjellytot14)
Ek= 1/2mv2 ?
And GPE? As the car drops 87% of the energy it has at the top gets converted to KE/
And GPE? As the car drops 87% of the energy it has at the top gets converted to KE/
So would you work out GPE using GPE=mgh and then multiply this by 0.87 and then sub into the KE equation and solve for V?
8. (Original post by jessyjellytot14)
So would you work out GPE using GPE=mgh and then multiply this by 0.87 and then sub into the KE equation and solve for V?
Yes

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