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Question

A lift is moving down with acceleration a. A man in the lift drops a ball inside the lift. The acceleration of the ball as observed by the man in the lift and a man standing stationary on the ground are respectively


A

g,g

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B

ga,ga

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C

ga,g

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D

a,g

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Solution

The correct option is C

ga,g


Step 1: Given data

Acceleration of the lift w.r.t ground, alg=a

Step 2: Find acceleration of ball w.r.t ground and the person who is standing in the lift

Acceleration of ball w.r.t. ground, abg=g

Acceleration of ball w.r.t. to the person who is standing in the lift, abl=abgalg

=g-a

Hence, option (C) is correct.


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