Two Balls of Equal Size Are Dropped from the Same

Two balls of equal size are dropped from the same height from the roof of a building. One ball has twice the mass of the other. When the balls reach the ground, how do the kinetic energies of the two balls compare?

A) The lighter one has one fourth as much kinetic energy as the other does.
B) The lighter one has one half as much kinetic energy as the other does.
C) The lighter one has the same kinetic energy as the other does.
D) The lighter one has twice as much kinetic energy as the other does.
E) The lighter one has four times as much kinetic energy as the other does.

Correct Answer:

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