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
B
ga,ga
C
ga,g
D
a,g

Solution

## The correct option is C $$g - a, g$$Lift is accelerating downwards, so acceleration of lift w.r.t. ground  $$a_{lg} = a$$Acceleration of ball w.r.t. ground  $$a_{bg} = g$$Acceleration of ball w.r.t. lift   $$a_{bl} = a_{bg} - a_{lg} = g-a$$Physics

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