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April 19, 2015

Homework Help: Physics

Posted by Emily on Saturday, September 8, 2012 at 5:44pm.

An attacker at the base of a castle wall 3.82 m high throws a rock straight up with speed 7.10 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?
__ 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 7.10 m/s and moving between the same two points.
__ m/s

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