Arturo O. answered • 04/29/18

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Set y = 0 and solve the resulting quadratic equation for t.

0 = -16t

^{2}+ (500sin45°)t = t(-16t + 500sin45°)There are 2 solutions:

(1)

t = 0, but that is when you start from the ground, so ignore this one.

(2)

-16t + 500sin45° = 0

Solve for t, which you can do easily. This is the solution you want.