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 / s ^2 , the reading of the s

Question

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 / s ^2 , the reading of the spring balance will be ( g =9.8 ~m / s ^2 )

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Correct answer: B. 24 ~N

For downward accelration of the lift, Mg T = ma T = m ( g - a ) ....(i) W = mg m = W g = 49 9.8 ....(ii) Put (ii) into (i) T = 49 9.8 (9.8-5)=5(4.8)=24 ~N

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 / s ^2 , the reading of the spring balance will be ( g =9.8 ~m / s ^2 )

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