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A particle mass m is driven by a machin...

A particle 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

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

B

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

C

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

D

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

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