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A plank is moving with a velocity 4 m/s. A disc of radius 1 m rolls on it without slipping with an angular velocity of 3 rad/s as shown in figure. Then, the velocity of the centre of the disc (Vcm) is

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A plank is moving with a velocity 4 m/s. A disc of radius 1 m rolls on it without slipping with an angular velocity of 3 rad/s as shown in figure. Then, the velocity of the centre of the disc (Vcm) is






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