A body is moving with constant speed over a f | vedclass

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(C) The work done by a force is given by the formula $W = F \cdot s \cdot \cos(	heta)$,where $	heta$ is the angle between the force and the displace

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(C) The work done by a force is given by the formula $W = F \cdot s \cdot \cos(	heta)$,where $	heta$ is the angle between the force and the displacement.In this case,the weight of the body acts vertically downwards,while the displacement of the body is horizontal (along the surface).Since the angle between the vertical weight and the horizontal displacement is $90^\circ$,we have $\cos(90^\circ) = 0$.Therefore,the work done by the weight is $W = F \cdot s \cdot 0 = 0$.

$A$ body is moving with constant speed over a frictionless surface. What is the work done by the weight of the body?

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