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

The answer is B.