A stone is thrown vertically upward with an initial speed of 20 m/s. When it returns, it fall into a hole that is 12.0 m deep. What is the velocity of the rock (in m/s) when it hits the bottom of the hole? Use -9.80 m/s2 for the local acceleration due to gravity and assume no significant air resistance. Assume that the y axis is positive in the up direction.
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