Question

A girl throws a ball at a fence 10m away. The ball is 2m from the ground when it
leaves her hand with an initial velocity of v=8 i+8 j m/s. When the ball hits the
fence its horizontal velocity component is reversed (the vertical velocity component
is unchanged). Where does the ball hit the ground?

Answer 1

Calculat the distance d (metres) it hits the ground when there is no wall. Use reflection to calculate the bounce off the wall.

Then
case 1: if d>10 m.
Ball hits ground at (d-10) before the wall.
case 2: if d<10 m.
Ball hits ground at d m. from the girl.