Question

A solid plastic ball hits a stationary tennis ball in a perfectly elastic collision. If the mass of the plastic ball is three times that of the tennis ball, which statement is true? The two balls separate but continue to move in the same direction. The two balls stick and move together. The plastic ball stops and the tennis ball starts moving. The plastic ball moves backward.

Answer 1

The two balls separate but continue to move in the same direction

Answer 2

Answer: The two balls separate but continue to move in the same direction.

Explanation: due to the mass of the plastic ball the stationary tennis ball gets energy from the collision which make it move away from the plastic ball due to its elastic property