A boy throws a rubber ball vertically upwards. What type of work is done; (a) by the force applied by the boy (b) by the gravitational force ? Support your answer with reason

CBSE Class 9 CBSE Class 9 Science
1

(a) Work done is positive as displacement is in the direction of the applied force.
(b) Work done is negative as displacement is in a direction opposite to the direction of the applied force.