An attacker at the base of a castle wall 3.85 m high throws a rock straight up with speed 8.50 m/s from a height of 1.45 m above the ground.
(a) will the rock reach the top of the wall? yes no correct: your answer is correct.
(b) if so, what is its speed at the top? if not, what initial speed must it have to reach the top? m/s
(c) find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 8.50 m/s and moving between the same two points. m/s
(d) does the change in speed of the downward-moving rock agree with the magnitude of the speed change of the rock moving upward between the same elevations? yes no correct: your answer is correct.
(e) explain physically why it does or does not agree.