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If a body of mass m is carried by a lift...

If a body of mass `m` is carried by a lift moving with an upward acceleration `a `, then the forces acting on the body are (i) the reaction `R` on the floor of the lift upwards (ii) the weight mg of the body acting vertically downwards. The equation of motion will be given by

A

`R=ma-mg`

B

`R=mg+ma`

C

`R=mgxxma`

D

`R=mg-ma`

Text Solution

Verified by Experts

The correct Answer is:
B
For a lift moving upwards with an acceleration 'a' the equation of motion is `R= mg+ma`.
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