A light thread has been tightly wrapped ...

A light thread has been tightly wrapped around a disc of mass M and radius R. The disc has been placed on a smooth table, lying flat as shown.

The other end of the string has been attached to a mass `m` as shown. The system is released from rest. If `m = M`, which point of the disc will have zero acceleration, immediately after the system is released?

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The correct Answer is:

A point at a distance `(R)/(2)` from centre

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