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A spring balance is attached to the ceil...

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

A

49 N

B

24 N

C

74 N

D

15 N

Text Solution

Verified by Experts

The correct Answer is:
B
when the lift is stationary, w = Mg
`implies 49 =M (9.8) implies M = 5kg`
when the lift is moving downward with an accleration

M g -t = ma `implies ` T =m g (g-a)
T = 5 [9.8-5] =24n
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