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Question

A weight is suspended from the ceiling of a lift by a spring balance. When the lift is stationary the spring balance reads W. If the lift suddenly falls freely under gravity, the reading on the spring balance will be
  1. W
  2. 2 W
  3. 0


Solution

The correct option is D 0
Reading of spring balance R=m(ga)
If the lift falls freely then a = g  R=0

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