   Chapter 5, Problem 18CQ

Chapter
Section
Textbook Problem

A certain truck has twice the mass of a car. Both are moving at the same speed. If the kinetic energy of the truck is K, what is the kinetic energy of the car? (a) K/4 (b) K/2 (c) 0.71K (d) K (e) 2K

To determine
The kinetic energy of the car.

Explanation

Given info: The truck and the car are moving with the same speed. The truck mass is twice of the car. The kinetic energy of the truck is K .

The kinetic energy of a particle is given by,

KE=12mv2

• m is the mass of the particle
• v is the velocity of the particle

Kinetic energy depends on the mass and the speed of the particle.

Since the speed of the truck and the car are same, the kinetic energy will be different due to the contribution of mass.

Kinetic energy depends directly on the mass

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