Question

A body is being raised to a height h from the surface of earth.What is the sign of work done by
(a)applied force
(b)Gravitational force

Answer 1

When a body is raised to a height h,it moves opposite to the direction of gravitational force on it.Therefore,

(a)Work done by applied force is positive since the body moves in the direction of applied force.

(b)Work done by gravitational force is negative.