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A spring balance

Question:

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads $49 \mathrm{~N}$, when the lift is stationary. If the lift moves downward with an acceleration of $5 \mathrm{~m} / \mathrm{s}^{2}$, the reading of the spring balance will be

1. $24 \mathrm{~N}$

2. $74 \mathrm{~N}$

3. $15 \mathrm{~N}$

4. $49 \mathrm{~N}$

Correct Option: 1

Solution: