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(B) When a body moves with a constant speed $v$ along a circle,it experiences a centripetal acceleration directed towards the center,although its line

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no work is done on it

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(B) When a body moves with a constant speed $v$ along a circle,it experiences a centripetal acceleration directed towards the center,although its linear speed remains constant.Since the centripetal force $F$ acting on the body is always directed towards the center and the displacement $s$ is always along the tangent to the circle,the angle $	heta$ between the force and the displacement is $90^{\circ}$.The work done $W$ is given by the formula:$W = F \cdot s = F s \cos 	heta$Since $	heta = 90^{\circ}$,we have $\cos 90^{\circ} = 0$.Therefore,$W = F s (0) = 0$.Hence,no work is done on the body.

When a body moves with a constant speed along a circle,

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