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Solve the Problem tt Seconds Is h=−15t2+570th = - 15 t ^ { 2 } + 570 t

Question 374

Multiple Choice

Solve the problem.
-A projectile is thrown upward so that its distance above the ground after tt seconds is h=−15t2+570th = - 15 t ^ { 2 } + 570 t . After how many seconds does it reach its maximum height?


A) 9 s9 \mathrm {~s}
B) 19 s19 \mathrm {~s}
C) 38 s38 \mathrm {~s}
D) 28.5 s28.5 \mathrm {~s}

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