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A rubber ball of mass \( 4 \mathrm{kg} \) has the same diameter as a plastic ball of mass 0.5 kg. Both the balls are dropped simultaneously from the roof of a building.When they are \( 8 \mathrm{m} \) above the ground,they have the same

1. Kinetic energy
2. Potential energy
3. Momentum
4. Acceleration

Correct answer: Acceleration

Solution

If air resistance is neglected, both balls are in free fall and experience the same gravitational acceleration, g. Their masses differ, so their kinetic energy, potential energy, and momentum are not the same at that height.

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