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  4. An object of mass 5 kg is attached to the hook of a spring balance and the balance is suspended vertically from the roof of a lift. The reading on the spring balance when the lift is going up with an acceleration of 0.25 ms-2 is (g=10 text ms-2)

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Q. An object of mass $ 5\, kg $ is attached to the hook of a spring balance and the balance is suspended vertically from the roof of a lift. The reading on the spring balance when the lift is going up with an acceleration of $ 0.25 $ $ m{{s}^{-2}} $ is $ (g=10\text{ }m{{s}^{-2}}) $

KEAMKEAM 2008Laws of Motion

Solution:

On moving upward, weight,
$ w=(mg+a)=5(10+0.25) $ $ =5\times 10.25 $ $ =51.25N $