Physics homework question. please help!?

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michellew1221

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There were several parts to this question, I figured out the first 2 with no problems but I am stuck on C. any help is appreciated!!

GIVEN:
A 2kg body is pushed by a force p=35N a distance of 3 meters up a ramp that is inclined 40degrees to the horizontal. The force P is parallel to the ramp.

a. what is the work done by the force P.
i found that to be 80.4 Joules.
b. what is the change in gravitational potential energy of the body?
i found this to be 37.8 Joules.
c. at the top of the ramp the body is stopped and then released. It slides down the ramp against a friction force of 10 N. Find the body's change in Kinetic energy in Joules after traveling a distance of 3 meters down the ramp.
------ this is where I'm stuck, please help!!!!! :o(
 
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