JEE Main2003PhysicsLaws of MotionActual
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
- A24 ~N
- B74 ~N
- C15 ~N
- D49 ~N
Correct answer
A. 24 ~N
Step-by-step solution
Mass = 49 9.8 =5 ~kg . When lift is moving downward, apparent weight =5(9.8-5)=5 4.8=24 ~N