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? The yellow ball has greater kinetic energy, because it is rolling at a higher position above the ground. The red ball has greater kinetic energy, because it has a greater mass. The yellow ball has greater kinetic energy, because it is rolling at a greater speed. The red ball has greater kinetic energy, because it is releasing more thermal energy.

Question

Physics

Shaw

30 May, 17:26

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? The yellow ball has greater kinetic energy, because it is rolling at a higher position above the ground. The red ball has greater kinetic energy, because it has a greater mass. The yellow ball has greater kinetic energy, because it is rolling at a greater speed. The red ball has greater kinetic energy, because it is releasing more thermal energy.

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Answers (1)

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Manuel Brandt · Answer 1

In order to determine which ball has a higher kinetic energy, we first look at the formula of kinetic energy which is:

kinetic energy = 1/2 * mass * velocity²

The factors influencing the kinetic energy of an object are its mass and its velocity. Both of the balls have the same velocity; however, the red ball has a greater mass. Therefore,

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

We may also determine these quantitatively using the formula given and the kinetic energy of the yellow ball works out to be 9 J and that of the red ball is 13.5 J.