Topic: Work, Kinetic Energy and Potential Energy Solve the following Problems 1. A 75 kg man climb up a tree 20 ft. high and goes down in the same length of time. how much work does he do going up? How much work does he do going down? 2. A two ton - truck is travelling at the rate of 30 miles / hr. on a highway. What is its kinetic energy? 3. A body sliding from rest from the top of an inclined plane 40 ft long and inclined 300' above the horizontal. It continues to slide on the horizontal plane 20 ft long. If the coefficient of friction between the body and the plane is 0.2 with what velocity will it reach the end of the horizontal plane