일반물리학 1 — Potential Energy and Conservation of Energy: Problem 48

48 In Fig. 8-41, a block slides down an incline. As it moves from point A to point B, which are 5.9 m apart, force \(\vec{F}\) acts on the block, with magnitude 2.0 N and directed down the incline. The magnitude of the frictional force acting on the block is 10 N. If the kinetic energy of the block increases by 35 J between A and B, how much work is done on the block by the gravitational force as the block moves from A to B?