Calculate the velocity of a freely falling body after one second if it starts from rest. (Round your answer to the nearest integer; Choose all that apply )

10 m/sec

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39 km/hr

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1 km/sec

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100 cm/sec

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Solution

The correct option is A 10 m/sec
Anybody in free fall is under acceleration due to gravity (g) and thus accelerates at $9.8 m / s^{2}$ . When a body starts from rest, after one second it will gain an acceleration of $9.8 m / s^{2}$ and thus will be at a velocity of $9.8 m / s$ in the downward direction. When rounded off to the nearest integer, the answer becomes 10.

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