When a stone is rotated with uniform speed in horizontal plane by means of a string, the magnitu...

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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
(a) gravity
(b) our hand through the string
(c) Both gravity and our hand through the string
(d) None of the above
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