Question

A boy was playing with a spongy ball, compressing and releasing it. What will be the work done by the boy on the ball and the ball on the boy respectively at the time of compressing?

• A. Positive, Negative
• B. Negative, Positive
• C. Positive, Positive
• D. Negative, Negative

Answer 1

The correct option is A

Positive, Negative

At the time of compressing, the work done by the boy on the ball is positive as it causes the ball to squeeze which is in direction of force applied.
But the ball resists to change its shape and always tries to regain its original shape by opposing the force applied, therefore, the work done by the ball on the boy is negative.