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Question
In figure, what will be the sign of the velocity of the point P′, which is the projection of the velocity of the reference particle P . P is moving in a circle of radius R in anticlockwise direction.
Solution
As the particle on reference circle moves in the anti-clockwise direction. The projection will move from P’ to O towards the left.
Hence, in the position shown the velocity is directed from P' → P" i.e., from right to left, hence sign is negative.
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