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a wheel of perimeter 4 Pi m is rolling on a horizontal surface. The displacement of the point of contact of wheel and ground when the wheel completes one quarter of revolution is
See , the perimeter of wheel is 4 pi meter.So, each rotaion the wheel makes, it goes a distance 4 pi meter.So, the quarter of a revolution makes the displacement = (4 pi / 4) meter = pi meter = 3.14 meter.Hope you got the answer.
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