A 0.26-kg rock is thrown vertically upward from the top of a cliff that is 15 m high. When it hits the ground at the base of the cliff, the rock has a speed of 29 m/s. Assuming that air resistance can be ignored, find the initial speed of the rock. A. 23 m/s B. 24 m/s C. 0.37 m/s D. 0.44 m/s E. 0.83 m/s

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