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  4. When a stone is rotated with uniform speed in horizontal plane by means of a string, the magnitude of the momentum is fixed but its direction changes. A force is needed to cause this change in momentum vector. This force is provided by

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Q. When a stone is rotated with uniform speed in horizontal plane by means of a string, the magnitude of the momentum is fixed but its direction changes. A force is needed to cause this change in momentum vector. This force is provided byPhysics Question Image

Laws of Motion

Solution:

Correct answer is (b) our hand through the string