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At a place where the acceleration due to...

At a place where the acceleration due to gravity is `10"m sec"^(-2)` a force of 5 kg - wt acts on a body of mass 10 kg initially at rest. The velocity of the body after 4 second is

A

5 m/s

B

20 m/s

C

10 m/s

D

50 m/s

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The correct Answer is:
B
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