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

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Solution

Reading of spring balance $R = m (g - a)$
If the lift falls freely then a = g $∴$ R=0

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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

Reading of spring balance R=m(g−a) If the lift falls freely then a = g ∴ R=0

Reading of spring balance $R = m (g - a)$
If the lift falls freely then a = g $∴$ R=0