• A box of 25 kg is released from rest on a rough inclined plane and slides to the bottom. The plane is inclined at a 28⁰ angle to the horizontal and it is 3.4 m high. The coefficient of kinetic friction between the box and the plane is 0.3 .
• A. How much work is done by the normal force? 
• B. How much work is done by the gravitational force during this motion?
• C. How much work is done by the frictional force during this motion?
• D. What is the net work done on the box as it slides down the plane? (Be sure to include the sign.) 
• E. Use conservation of energy to determine the speed of the block as it reaches the bottom