A golf ball hits a wall and bounces back at 1/3 the original speed.What part of the original kinetic energy of the ball did it lose in the collision?

Question

Quizplus · Accepted Answer

The kinetic energy is proportional to the square of the speed. If the speed is reduced to 1/3, the kinetic energy becomes (1/3)^2 = 1/9 of the original. Therefore, it loses 1 - 1/9 = 8/9 of its original kinetic energy.

A Golf Ball Hits a Wall and Bounces Back at 1/3