A ball is thrown vertically upward with a velocity 'u' from the balloon descending with velocity v.After time,the ball will pass by the balloon ?

Explanation

`S_(r)=u_(r)t+(1)/(2)a_(r)t^(2)`
`O=(v+u)t-(1)/(2)"gt"^(2)`
`t=(2(v+u))/(g)`