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A spring balance is attached to the ceiling of lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5 m / s², the reading of the spring balance will be :

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49 N

24 N

74N

15 N

answer is B.

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Detailed Solution

Here, $R = M (g - a)$ ………..(1)
When lift is stationary R = M g……….(2)
$∴ 49 = M \times 9 \cdot 8 or M = 5 kg$
From eq. (1), R =5 (9.8 -5) =24N

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