A lift accelerated downward with acceler...

A lift accelerated downward with acceleration ' a '. A man in the lift throws a ball upward with acceleration `a_(0)(a_(0)lta)`. Then acceleration of ball observed by observer, which is on earth, is

`(a+a_(0))` upward

`(a-a_(0))` upward

`(a+a_(0))` downward

`(a-a_(0))` downward

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