26-{rm kg} rock is thrown vertically upward from the top of a cliff that is 31 {rm m} high. When it hits the ground at the base of the cliff, the…

A 0.26-{rm kg} rock is thrown vertically upward from the top of a cliff that is 31 {rm m} high. When it hits the ground at the base of the cliff, the rock has a speed of 31 {rm m/s}. Assuming that air resistance can be ignored, find the initial speed of the rock.

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