Question

5. A body, with mass m = 5 kg, rises with constant velocity at height h = 10 m under the action of a force F. Find the work done on the body: a) by the force F b) by the gravitational force of the Earth :

Answer 1

a)

$$W_F=mgh=(5)(9.8)(10)=490\ J$$

b)

$$W_G=-W_F=-490\ J$$