Question

Q.16
Two boys are standing on the top of a wall which is
400 m from the ground. The first boy drops a tennis
ball over the side of the wall. Two seconds later, his
friend throws another ball vertically downward
Calculate the required initial velocity of the second
ball in order for it to hit the ground at the same time as
the first ball.​

Answer 1

answer m telling in short 22.32 m/s