Sliding Block Physics Problem?

A 10-kg body is pushed by a force P= 80 N a distance of s=4 m up a ramp that is inclined 40o to the horizontal. The force P is parallel to the ramp. At the top of the ramp the body is stopped and then released. It slides down the ramp against a friction force of f= 20 Newtons. Find the body's change in kinetic energy in Joules after traveling a distance s= 4 m down the ramp. What is its velocity at this point in m/s?