Q: A lift accelerated downward with acceleration ‘ a ‘. A man in the lift throws a ball upward with acceleration  a0 (a0 < a) . The acceleration of the ball as observed by a man standing stationary on the ground is :
(a) (a + a0) upward

(b) (a – a0) upward

(c) (a + a0) downward

(d) (a – a0) downward

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Ans: (d)