Question

Can anyone help me with this? : http://i.imgur.com/aaBhz.jpg

I have the free-body diagram drawn and I think I have to break up the components but I can't find the angles

Answer 1

For part A) is it just T = ma = m(v^2/r)?

Answer 2

Yes. Same for the second part.
For the third part apply the work-energy theorem(The work done is equal to the change in kinetic energy).
Try it

Answer 3

I don't get the third part. W = force * distance so it's ΔT * Δr?

Answer 4

No,As I said it is the change in kinetic energy:
\[W=mv 1^{2}/2-mv2^{2}/2\]
where v1 is the initial velocity and v2 is the final velocity.
Now, can you do it?

Answer 5

yeah I got it now thanks :)