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

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

A

`sqrtmk t^(-1/2)`

B

`sqrt2mkt^(-1/2)`

C

`1/2sqrtmkt^(-1/2)`

D

`sqrt(mk)/(2)t^(-1/2)`

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