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Q.

A 2 kg stone is swung in a vertical circle by attaching it at the end of a string of length 2m. If the string can withstand a tension 140.6N, the maximum speed with which the stone can be rotated is

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a

22 ms–1

b

11 ms–1

c

33 ms–1

d

44 ms–1

answer is D.

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Detailed Solution

Tmax=mv2r+mg⇒140.6=2×v22+2×9.8
v = 11 m/s

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