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At the instant t=0, a force F=kt (k is a...

At the instant `t=0`, a force `F=kt` (k is a constant) acts on a small body of mass m resting on a smooth horizontal surface. The time, when the body leaves the surface is

A

`mgk sin alpha`

B

`(k sin alpha)/(mg)`

C

`(mg sin alpha)/(k)`

D

`(mg)/(k sin alpha)`

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The correct Answer is:
D
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