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Q.

A body of mass 2 kg at rest acquires a velocity of 10ms-1 in 4 seconds. The work done is

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a

100  ergs

b

109J

c

109ergs

d

1000J

answer is C.

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Detailed Solution

W=FScos⁡θ=ma12at2cos⁡θW=12mv−utv−ut⋅t2W=12×2×104×104×16W=100J=100×107ergsW=109ergs
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