The kinetic energy K of a mass is proportional to the square of its velocity v. If K = 14,450 joules when v = 17 m/sec, what is K when v = 13 m/sec?
A) 8450
B) 6760
C) 10,140
D) 9295

Question

Quizplus · Accepted Answer

K is proportional to v^2, so K/v^2 is a constant. If K = 14,450 joules when v = 17 m/sec, then K/v^2 = 14,450/17^2 = 50. Therefore, when v = 13 m/sec, K = 50 * 13^2 = 8450 joules.

The Kinetic Energy K of a Mass Is Proportional to the Square