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A disc of mass m and radius R lies flat ...

A disc of mass `m` and radius R lies flat on a smooth horizontal table. A mass less string runs halfway around it as shown in figure. One end of the string is attached to a small body of mass `m` and the other end is being pulled with a force F. The circumference of the disc is sufficiently rough so that the string does not slip over it. Find acceleration of the small body.

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The correct Answer is:
`a = (F)/(4m)`
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