A car starts from rest and after 6.0 seconds it has a kinetic energy of 60,000 J. How much horsepower is needed for the car to acquire this kinetic energy?
A) 6.0 hp
B) 60 hp
C) 0 hp
D) 1.3 hp
E) 13 hp

Question

Quizplus · Accepted Answer

Horsepower is a unit of power, and power is the rate of energy transfer. The car's kinetic energy is 60,000 J, and it takes 6 seconds to reach this energy. Power = Energy/Time = 60,000 J / 6 s = 10,000 W. 1 horsepower is approximately 746 W, so 10,000 W is about 13.4 hp, which rounds to 13 hp.

A Car Starts from Rest and After 6