If a ball A is dropped while B is projected vertically down. Which ball will reach the ground (a) first (b) with greater velocity?

Answer

(a)B,(b)B

Explanation

(a) `t_(A)=sqrt((2h)/(g))` while `t_(B)=((u^(2)+2gh)^(1//2))/(g)`
(b) `v_(A)=sqrt(2gh)` while `v_(B)=sqrt((u^(2)+2gh))`