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Q.

A particle is hanging from a fixed pint 0 by means of a string of length L. There is a small nail O' in the same horizontal line with O at a distance l(

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a

3gL

b

5gL

c

g(5L−3ℓ)

d

g(5ℓ−3L)

answer is C.

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Detailed Solution

From conservation of mechanical energy.12mv2=mgL+12mg(L−ℓ)g∴ v=g(5L−3ℓ)
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