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a ball is thrown from an initial 5 feet with an initial upward velocity of 17 ft per second the balls height H( in feet) after T seconds is given by the following.h=5+17t-16t^2find all values of t for which the balls height is 9 ft. round your answer(s) to the nearest hundreds .

Answer :

9 = 5 + 17t - 16t^2

16t^2 - 17t - 5 + 9 = 0

16t^2 - 17t + 4 = 0

Solving the square equation

first tiime = 0.35 s

second time = 0.71 s

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