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The height, S of the ball after T seconds when thrown straight up with an initial speed of 70 ft. Per second from an initial high of 5 feet can be modeled by the function s(t)=-16t^2+70t+5

(A.) when will the height of the hall be 50 feet
(B.) when will the height of the ball be 60 feet
(C.) will the ball ever reach a height of 140 feet



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