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Question

A stone of mass 0.2kg is tied to one end of a thread of length 0.1m whirled in a vertical circle. When the stone is at the lowest point of circle, tension in thread is 52N, then velocity of the stone will be:

A
4m/s
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B
5m/s
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C
6m/s
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D
7m/s
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Solution

The correct option is B 5m/s
Tmg=mv2rT=mv2r+mg52=0.2(10)+0.2(v2)0.12v2=522=50v=5m/sec

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