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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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a
1.82 ms–1
b
2.2 ms–1
c
3.26 ms–1
d
2.87 ms–1

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detailed solution

Correct option is B

T=mg+mv2r58.8=9.8+(1)v20.549=v20.5

v2=492v=71.4=5 ; 5gr=5

Vtop=gr=55=5=2.2 m/s

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