A block slides down an inclined plane (incline angle = 37^o). The mass of the block is 42 kg, the coefficient of kinetic friction between the block and the ramp is 0.2, and the length of the ramp is 6 

Find the following                                     

1) How much work is done by gravity?                         

2)   How much work is done by friction?                       

3)Prove that W_net = Total work of all forces. 

4) Define Work - Kinetic Energy Theorem. 

5) How much work is done by normal force?