Rachel is on the roof of a building h meters above ground, Physics

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Rachel is on the roof of a building h meters above ground

Rachel is on the roof of a building, h meters above ground. She throws a heavy ball into the air with a speed v, at an angle ? with respect to the horizontal. Ignore air resistance.

a) Find the speed of the ball when it hits the ground in terms of h, v, ?, and g.
b) For what value(s) of ? is the speed of the ball greatest when it hits the ground?

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