Help needed immediately!!! A = 50kg B = 100kg coefficient of friction = 0.25 A is moving along the inclined plane for 20m.What is the change of kinetic energy of A if the initial velocity of A is 0? Work done by friction force = change in KE. + change in PE My lecturer told me to find out the change of KE by using this equation. But in my opinion, isn`t the total work done = change in KE. + change in PE ??