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Q.

An elastic string carrying a body of mass ‘m’ extends by ‘e’. The body rotates in a vertical circle with critical velocity. The extension in the string at the lowest position is

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a

8e

b

2e

c

6e

d

4e

answer is C.

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Detailed Solution

Initially,

FA=Y∆ll

mgA=Yel

But a centripetal force also operates when an object is rotating in a circle.
​mg+mv2RA=Ye1l

6mgA=Ye1l

e1=6e

Hence the correct answer is 6e.

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