An attacker at the base of a castle wall 3.63 m high throws a rock straight up with speed 8.80 m/s at a height of 1.51 m above the ground.
(b) If the rock will reach the top, what is its speed? If it will not, what initial speed must it have to reach the top? Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 8.80 m/s and moving between the same two points. m/s