Question

A boy was playing with a spongy ball; compressing and releasing it. The work done by the boy on the ball and the ball on the boy respectively at the time of compression is

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

Answer 1

The correct option is A

Positive, Negative

During compression, the work done by the boy on the ball is positive as it causes the ball to squeeze in direction of force applied. But, at the same time, the ball resists the change in its shape, as it always tries to regain its original shape by opposing the force applied. Therefore, the work done by the ball on the boy is negative.