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Q.

When a mass is suspended from the end of a wire the top end of which is attached to the roof of a lift. The extension is 'e' when the lift is stationary. If the lift moves up with a constant acceleration g/2 the extension of the wire would be ...

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a

3e

b

3e/2

c

2e/3

d

2e

answer is B.

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Detailed Solution

T1 = mg
T2 = mg + ma = mg + mg/2 = 3mg/2
Now, e=TlAY⇒e∝T
 ∴e2e1=T2T1=32⇒e2=3e2

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