A juvenile delinquent wants to break a window near the top of a tall building using a rock. The window is 30 m above ground level, and the base of the building is 20 m from his hiding spot behind a bush. Find the minimum speed the rock must have when it leaves his hand. Also find the corresponding launch angle of the rock. Hint: Graph how the initial velocity changes as a function of launch angle to find the minimum value needed and the corresponding launch angle. Ignore air drag.
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