Question

A ball projected vertically upwards from the top of a tower,with a velocity 20m/sec reaches the ground in t_{1 }seconds. If it is projected vertically downwards from the top with the same velocity,it reaches the ground in t_2 seconds. Relationship between t_1 & t_2 will be: {(a)}t_1-t_2=4 (b)t_{2-}t_1=4 (c)t_1+t_2=4 (d)None of these

Answer 1