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A boy having a mass equal to 40 kilograms is standing in an elevator. The force felt by the feet of the boy will be greatest when the elevator (g = 9.8 metre/sec 2 )-

1. Stands still
2. Moves downwards at a constant velocity of 4 metre/sec.
3. Accelerates downward with an acceleration equal to 4 metres/sec 2
4. Accelerates upward with an acceleration equal to 4 metres/sec 2

Correct answer: Accelerates upward with an acceleration equal to 4 metres/sec 2

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