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posted by lily on Thursday, April 7, 2011 at 7:25pm.

Tyler is on the 15th floor of a building. She throws a ball straight down from the window, which is 220 feet above the ground. How fast must she throw the ball(in feet per second) for it to hit the ground in 3 seconds?

d = Vo*t + 0.5gt^2 = 220Ft. 3Vo + 0.5 * 32 * 3^2 = 220, 3Vo + 144 = 220, 3Vo = 220 - 144 = 76, Vo = 25.33 Ft/s.

Lily,check your 4-5-11,6:42pm post for solution to your proportions prob.

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