A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring balance 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 (g = 9.8 m/s²) (a) 15 N (b) 24 N (c) 49 N (d) 74 N

Answer: (b). m = 49/9.8 = 5 kg. Lift going down with a: reading = m(g - a) = 5(9.8 - 5) Reading = 5 × 4.8 = 24 N So the answer is (b) 24 N.

A spring balance is attached to the ceiling of a lift. A man hangs… | MHT CET 2023 (13 May, Shift 2)

Q7MHT CET 2023 · 13 MAY · SHIFT 2Easy

Apparent Weight & Lift

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring balance reads $49\text{ N}$ , when the lift is stationary. If the lift moves downward with an acceleration of $5\text{ m/s}^{2}$ , the reading of the spring balance will be $\left(g = 9.8\text{ m/s}^{2}\right)$

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Answer: (b)

$m = \frac{49}{9.8} = 5$ kg.
Lift going down with $a$ : reading $= m(g - a) = 5(9.8 - 5)$
Reading $= 5 \times 4.8 = 24$ N
So the answer is (b) 24 N.

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Apparent Weight & Lift question from MHT CET 2023 (13 May, Shift 2)

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