An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 8.20 m/s from a height of 1.50 m above the ground. (a) Will the rock reach the top of the wall? O Yes O No (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 8.20 m/s and moving between the same two points. m/s

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Chapter1: Units, Trigonometry. And Vectors
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An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 8.20 m/s from a height of 1.50 m above the ground.
(a) Will the rock reach the top of the wall?
O Yes
O No
(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 8.20 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?
O Yes
O No
(e) Explain physically why it does or does not agree.
Transcribed Image Text:An attacker at the base of a castle wall 3.95 m high throws a rock straight up with speed 8.20 m/s from a height of 1.50 m above the ground. (a) Will the rock reach the top of the wall? O Yes O No (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 8.20 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? O Yes O No (e) Explain physically why it does or does not agree.
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