A ball is thrown vertically down with velocity of 5m//s. With what velocity should another ball be thrown down after 2 seconds so that it can hit the 1^(st) ball in next 2 second.

A ball is thrown vertically down with velocity of 5m//s. With what vel

1.	A ball is thrown vertically down with velocity of 5m//s. With what velocity should another ball be thrown down after 2 seconds so that it can hit the 1^(st) ball in next 2 second.
Answer» `40m//s` `10m//s` `15m//s` `20m//s` ANSWER :A