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Manipal MET2018PhysicsMotion in One Dimension

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N , when the lift is stationary. If the lift moves downward with an acceleration of 5 ~m / s ^2 , the reading of the spring balance will be

Options

  1. A49 N
  2. B24 N
  3. C74 N
  4. D15 N

Correct answer

B. 24 N

Step-by-step solution

When the lift is stationary ( w = mg ) ( aligned & 49=m 9.8 & m=5 ~kg aligned ) When the lift is moving downward with an acceleration (R=m(9.8-a)=5(9.8-5)=24 N )

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