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An object is suspended from a spring bal...

An object is suspended from a spring balance in a lift. The reading is 240 N when the lift is at rest. If the spring balance reading now change to 220N, then the lift is moving

A

downward with constant speed

B

downward with decreasing speed

C

downward with increasing speed

D

upward with increasing speed

Text Solution

Verified by Experts

The correct Answer is:
C
When the lift is at rest, the spring balance gives the true weight of the block. But when the lift is moving down with an increasing speed or if it has a downward acceleration, (a) the effective value of g becomes `(g-a)` and the apparent weight lt true weight.
As 220 N lt 240 N. Thus the lift is moving downward.
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