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January 31, 2015

Homework Help: physics..help PLEASE!

Posted by kelsey on Wednesday, October 8, 2008 at 12:42am.

A 0.26 kg rock is thrown vertically upward from the top of a cliff that is 35 m high. When it hits the ground at the base of the cliff the rock has a speed of 28 m/s.
(a) Assuming that air resistance can be ignored, find the initial speed of the rock.

(b) Find the greatest height of the rock as measured from the base of the cliff.

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