A stone of mass is attached to a light

PHYSICS · Single correct · ISC · Physics · Laws of Motion · Laws of Motion

Problem

A stone of mass mm is attached to a light, inextensible string of length rr and is whirled in a vertical circle. What should be the minimum speed of the stone at the lowest point so that the string remains taut throughout the motion? (a) 6 gr\sqrt{6\,gr} (b) 5 gr\sqrt{5\,gr} (c) 3 gr\sqrt{3\,gr} (d) 4 gr\sqrt{4\,gr}

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