How much energy is dissipated in braking a 1200-kg car to a stop from an initial speed of 30 m/s?

Name: How much energy is dissipated in braking a 1200-kg car to a stop from an initial speed of 30 m/s?
Brand: Quizplus
Rating: 4.9 (57 reviews)

Question

Quizplus · Accepted Answer

The kinetic energy of the car when it is traveling at 30 m/s is given by KE = 1/2mv^2 = 1/2(1200 kg)(30 m/s)^2 = 540,000 J. This is the amount of energy that needs to be dissipated in order to bring the car to a stop. Therefore, the answer is C) 540,000 J.

How Much Energy Is Dissipated in Braking a 1200-Kg Car