Question

A yellow ball with a mass of 2 kg is rolling across the floor at 3 m/s. A red ball with a mass of 3 kg is rolling across the same floor at 3 m/s. Which ball has greater kinetic energy, and why?

Answer 1

Answer:

The red ball has greater kinetic energy because it is moving at the same speed as the yellow ball, which is lighter than the red ball.

Explanation:

Formula for kinetic energy: 1/2mv²

Yellow ball:

= 1/2(2)(3)²

=1/2(2)(9)

= 9J

Red ball:

= 1/2(3)(3)²

=1/2(3)(9)

= 13.5J

Answer 2

Answer:

The red ball has greater kinetic energy, because it has a greater mass.