Question

A box of mass 40kg is being dropped along the floor by a rope inclined 60degree to the horizontal.The frictional force between the box and the floor is 100N and the tension of the rope is 300N. How much work in dragging the box through a distance of 4m

Answer 1

The net work of is

$$W=F_\text{net}d,\\ W=(300\cos60°-100)4=200\text{ J}.$$