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Acceleration Due to Gravity

A body of mas...

Question

A body of mass 2kg is hung on a spring balance mounted vertically in a lift . If the lift descends with an acceleration equal to the acceleration due to gravity 'g' , the reading on the spring balance will be
(A)2kg (B) (4×g)kg (C) (2×g)kg (D) Zero

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Solution

The equation for apparent weight
W=M(g-a)
Here a=g

So W=M(g-g)
=0

Option D

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