A car moves 4 times as fast as another identical car.Compared to the slower car,the faster car has
A)4 times the KE.
B)8 times the KE.
C)12 times the KE.
D)16 times the KE.

Question

Quizplus · Accepted Answer

The kinetic energy (KE) of an object is proportional to the square of its velocity. If the faster car moves 4 times as fast as the slower car, then its velocity is 4^2 = 16 times greater than the slower car. Therefore, the faster car has 16 times the KE of the slower car.

A Car Moves 4 Times as Fast as Another Identical