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A particle of mass m is driven by a mach...

A particle of mass m is driven by a machine that delivers a constant power k watts. If the particle starts from rest the force on the particle at time t is

A

`(sqrtfrac(mk)(2) t^frac(-1)(2))`

B

`sqrtmk t^frac(-1)(2)`

C

`sqrt2mk t^frac(-1)(2)`

D

`frac(1)(2) sqrtmk t^frac(-1)(2)`

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