A body of mass 100 kg stands on a spring weighing machine inside a lift. The lift starts to
ascend with acceleration of 2.2 m s-2. What is the reading of the machine?
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A body of mass 100 kg stands on a spring weighing machine inside a lift. The lift starts to
ascend with acceleration of 2.2 m s-2. What is the reading of the machine?
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◆ Answer -
Reading = 120 kg
◆ Explanation -
Let a be acceleration of the lift and g be gravitational acceleration.
Acceleration felt by object in lift moving upwards is -
a' = a + g
a' = 9.8 + 2.2
a' = 12 m/s^2
Reading in the weighing machine of lift be -
Reading = m × a'/a
Reading = 100 × 12 / 10
Reading = 120 kg
Therefore, weighing machine will read 120 kg.
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