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A spring balance is attached to the ceil...

A spring balance is attached to the ceiling of a lift. When the lift is at rest spring balance reads 49 N of a body hang on it. If the lift moves:
(i) Downward (ii) upward, with an acceleration of `5 ms^(-2)` (iii) with a constant velocity.
What will be the reading of the balance in each case?

Text Solution

Verified by Experts

(i) ` R = m (g -a)`
weight = 49 N
so `m = (49)/(9.8) = 5kg `
`R = 5 (9.8 - 5)`
R = 24 N
(ii) `R = m(g + a)`
R = 5(9.8 + 5)
R = 74 N
(iii) as ` a = 0 , so R = mg = 49 N`
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