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A body of mass m starting from rest is a...

A body of mass m starting from rest is acted on by a force producing a velocity `v=sqrt(k times s)` where k is a constant and s is displacement. The work done by the force in the first t seconds is
1) `m^(2)k^(2)t^(2)/8`
2) `mk^(2)t^(2)/4`
3) `mk^(2)t^(2)/8`
4) `m^(2)k^(2)t/8`

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