An object hits a wall and bounces back with half of its original speed. What is the ratio of the final kinetic energy to the initial kinetic energy of the object?
A) 1/2
B) 1/8
C) 1/4
D) 1/16

Question

Quizplus · Accepted Answer

The kinetic energy (KE) is given by the formula KE = 1/2 mv^2, where m is the mass and v is the velocity. If the final speed is half of the original, the final kinetic energy is (1/2) * m * (1/2 * v)^2 = 1/2 * m * 1/4 * v^2 = 1/4 of the initial kinetic energy.

An Object Hits a Wall and Bounces Back with Half