Question

A tennis ball makes a perfectly elastic collision with a wall and bounces straight back with a speed of 10.0 m/sec. The mass of the ball is 100 g and the time of contact with the wall is 1.00 x 10-2 sec. Find the force acting on the ball exerted by the wall.

Answer 1

Answer:

Perfectly Elastic Collision refers to velocity in the opposite direction with the same magnitude.

⇒ Change in Velocity = 10 - ( -10 ) = 20 m/s

As the direction is opposite we take minus sign by convention.

Acceleration = Change in Velocity / Time

⇒ Acceleration = 20 m/s / 0.01 s

⇒ Acceleration = 2000 m/s²

⇒ Force = Mass × Acceleration

⇒ Force = 0.1 kg × 2000 m/s²

⇒ Force = 200 N

Therefore the wall exerts a force of 200 N on the ball after collision.

Hope it helped !!