establish relationship between power and velocity
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In the straightforward cases where a constant force moves an object at constant velocity, the power is just P = Fv. In a more general case where thevelocity is not in the same direction as the force, then the scalar product of force and velocity must be used.
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since P=w/t
w=F.d
P=F.d/t (d/t=v)
P=F.v
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