A 1000.0 kg car is moving at 15 km/h. If a 2000.0 kg truck has 18 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. Since the truck has 18 times the kinetic energy of the car, and the mass of the truck is twice the mass of the car, the velocity of the truck must be 3 times the velocity of the car. Therefore, the truck is moving at 3 * 15 km/h = 45 km/h.

A 10000 Kg Car Is Moving at 15 Km/h