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Predict/Explain Ball 1 is thrown to the ground with an initial downward speed; ball 2 is dropped to the ground from rest. Assuming the balls have the same mass and are released from the same height, is the change in gravitational potential energy of ball 1 greater than, less than, or equal to the change in gravitational potential energy of ball 2? (b) Choose the best explanation from among the following:
- I. Ball 1 has the greater total energy, and therefore more energy can go into gravitational potential energy.
- II. The gravitational potential energy depends only on the mass of the ball and the drop height.
- III. All of the initial energy of ball 2 is gravitational potential energy.
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