The breaking strength of a string is 55kg wt. The maximum permissible speed of a stone of mass 5kg which is revolved in a vertical circle of radius 4m with the help of this string is (g=10m/s2):
10m/sec
15m/sec
20m/sec
25m/sec
A
20m/sec
B
10m/sec
C
25m/sec
D
15m/sec
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Solution
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Tmax=55kgwt. =55N. T is maximum at bottom point. where, T−mg=mv2R
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