You want to throw a pebble at a window located 9.6 m above the ground, making sure that the pebble hits the lowest part of the window with a strictly horizontal velocity. You are standing 9 m from the base of the wall and you are throwing the pebble from a height of 1.6 m above the ground.
(a) Provide a sketch of the situation.
(b) What is the launch velocity?
(c) What is the velocity with which the pebble hits the window?