Two identical billiard balls strike a rigid wall with the same speed, and are re

Question

Two identical billiard balls strike a rigid wall with the same speed, and are reflected without any change of speed. The first ball strikes perpendicular to the wall. The second ball strikes the wall at an angle of 30º from the perpendicular, and bounces off at an angle of 30º from perpendicular to the wall. Determine the direction of the force on the wall due to each ball.

A) Perpendicular to the wall

B) Parallel to the wall

C) At 30 degrees relative to the wall

D) At 60 degrees relative to the wall

Explanation / Answer

A) Perpendicular to the wall

Beacuse momentum of the ball changes in perpendicular direction only.

here momentum of the ball change in x-direction. there is no change in momentum of the ball in y- direcion.

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