A spring balance is attached to the ceiling of a 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 s - 2 , the reading of the spring balance will be

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 N , when the lift is stationary. If the lift moves downward with an acceleration of 5 m s - 2 , the reading of the spring balance will be, 49 N, 24 N, 74 N, 15 N

MARKS App · Accepted Answer

When the lift is stationary w = m g ⇒ 49 = m × 9.8 m = 5 k g When the lift is moving downward with an acceleration R = m 9.8 - a = 5 9.8 - 5 = 24 N

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