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A man in a lift ascending with an upward...

A man in a lift ascending with an upward acceleration `a` throws a ball vertically upwards with a velocity `v` with respect to himself and catches it after `t_1` seconds. After wards when the lift is descending with the same acceleration `a` acting downwards the man again throws the ball vertically upwards with the same velocity with respect to him and catches it after `t_2` seconds?

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Shape selective catalyst. These catalyst the reaction because of their specific shape so that reactant is get sttached in the pores of shape selective catalyst.
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