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 A rock takes 2.35 s  to hit the ground when it is thrown straight up from the cliff with an initial velocity of 8.00 m/s. How long a time would it take to reach the ground if it is thrown straight down with the same speed?

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Sagar Yadav
Sagar YadavLv10
24 Oct 2020

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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An attacker at the base of a castle wall 3.65 m high throws a rock straight up with a speed 7.40 m/s from a height of 1.55 m above the ground. (a)Will the rock reach the top of the wall? (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 of speed of a rock thrown straight down from the top of the wall at an initial speed of 7.40 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.

An attacker at the base of a castle wall 3.65 m high throws a rock straight up with a speed 7.40 m/s from a height of 1.55 m above the ground. (a)Will the rock reach the top of the wall? (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 of speed of a rock thrown straight down from the top of the wall at an initial speed of 7.40 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.

This one has been bugging me all day. Can any one help?

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