A stone of mass 1kg is tied to one end of a string of length 0.5 m. It is whirled in a vertical circle. If the maximum tension in the string is 58.8N, the velocity at the top is

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1.82 ms–1

2.2ms–1

3.26 ms–1

2.87 ms–1

answer is B.

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Detailed Solution

Conserving energy between top and the lowest positions.1/2 mu2 + mg.2l = 1/2 mV2⇒ u2 = V2 - 4 gl⇒ u2 = 49 / 2 -4 X 9.8 X 0.5⇒ u = 2.2 m/s

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