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27 Nov 2019
An attacker at the base of a castle wall 3.64 m high throws a rock straight up withspeed 8.70 m/s from a height of1.75 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 speedmust it have to reach the top?
m/s
(c) Find the change in speed of a rock thrown straight down fromthe top of the wall at an initial speed of 8.70 m/s and moving between the same twopoints.
m/s
(d) Does the change in speed of the downward-moving rock agree withthe magnitude of the speed change of the rock moving upward betweenthe same elevations? Explain physically why it does or does notagree.
An attacker at the base of a castle wall 3.64 m high throws a rock straight up withspeed 8.70 m/s from a height of1.75 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 speedmust it have to reach the top?
m/s
(c) Find the change in speed of a rock thrown straight down fromthe top of the wall at an initial speed of 8.70 m/s and moving between the same twopoints.
m/s
(d) Does the change in speed of the downward-moving rock agree withthe magnitude of the speed change of the rock moving upward betweenthe same elevations? Explain physically why it does or does notagree.
Jean KeelingLv2
17 Feb 2019
