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) g -a,g -a

(c) g -a,g

(d) a,g

Answer 1

Correct option (c) g -a,g
Explanation:

Apparent weight of ball,

Hence, apparent acceleration in the lift is g - a. Now, if the man is standing stationary on the ground, then the apparent acceleration of the falling ball is g.