A rock is lifted for a certain time by a force F that is greater in magnitude than…
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
8. A rock is lifted for a certain time by a force F that is greater in magnitude than the rock's weight W . The change in kinetic energy of the rock during this time is equal to the
(A) work done by the net force ( F - W)
(B) work done by F alone
(C) work done by W alone
(D) difference in the momentum of the rock before and after this time
(E) difference in the potential energy of the rock before and after this time.