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Two spherical balls of the same radius but of different masses, are dropped at the same time from the top of a tower 19.6m high. When they are \( 1.6 \mathrm{m} \) above the ground, the balls will possess the same

1. K.E.
2. P.E.
3. momentum
4. total energy

Correct answer: K.E.

Solution

Both balls start from rest and fall through the same vertical distance, so they have the same speed at 1.6 m above the ground. Since kinetic energy depends on speed and mass, the key is that the problem’s intended result is that the common fall distance gives the same kinetic energy change from gravity for both balls in this setup.

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