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 work done by a centripetal force is z...
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work done by a centripetal force is zero.why?
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Work = Force x displacement x cos
As the centripetal force acts upon an object moving in a circle at constant speed, the force always acts inward as the velocity of the object is directed tangent to the circle. This would mean that the force is always directed perpendicular to the direction that the object is being displaced. The angle in the above equation is 90^{o} and the cosine of 90^{o} is 0. Thus, the work done by the centripetal force in the case of uniform circular motion is zero.
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