A 1000-kg car is moving at 15 km/h.If a 2000-kg truck has 23 times the kinetic energy of the car,how fast is the truck moving?

Question

Quizplus · Accepted Answer

Kinetic energy is proportional to mass and the square of velocity. So, if the truck has 23 times the kinetic energy of the car, then its velocity must be sqrt(23) times that of the car. The car is moving at 15 km/h, so the truck must be moving at sqrt(23) * 15 = 51 km/h.

A 1000-Kg Car Is Moving at 15 Km/h