Question

An attacker at the base of a castle wall 3.85 m high throws a rock straight...

An attacker at the base of a castle wall 3.85 m high throws a rock straight up with speed 8.30 m/s from a height of 1.45 m above the ground.

(a) Will the rock reach the top of the wall?

yes/no
(b) If so, what is its speed at the top? If not, what initial speed must it have to reach the top?

(c) Find the change in speed of a rock thrown straight down from the top of the wall at an initial speed of 8.30 m/s and moving between the same two points.

(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?


(e) Explain physically why it does or does not agree.

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