Physics – 1.7.2 Work | e-Consult

Answer:

1. Calculate the work done on the block: W = Fd = 50 N × 2 m = 100 J.
2. The work done on the block is equal to the change in potential energy because the work done is equal to the force applied multiplied by the distance over which the force is applied. This force is acting against gravity, which is changing the block's height and therefore its potential energy. The work-energy theorem states that the net work done on an object is equal to the change in its kinetic energy. In this case, since the block is lifted at a constant velocity, its kinetic energy remains constant, and the work done is entirely converted into potential energy. Therefore, W = ΔPE.