Solve the problem.
-A projectile is thrown upward so that its distance above the ground after $t$ seconds is $h = - 15 t ^ { 2 } + 570 t$. After how many seconds does it reach its maximum height?
A) $9 \mathrm {~s}$
B) $19 \mathrm {~s}$
C) $38 \mathrm {~s}$
D) $28.5 \mathrm {~s}$

Question

Quizplus · Accepted Answer

The Answer of Solve the problem.
-A projectile is thrown upward so that its distance above the ground after $t$ seconds is $h = - 15 t ^ { 2 } + 570 t$. After how many seconds does it reach its maximum height?
A) $9 \mathrm {~s}$
B) $19 \mathrm {~s}$
C) $38 \mathrm {~s}$
D) $28.5 \mathrm {~s}$

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

Solve the Problem $t$ Seconds Is $h = - 15 t ^ { 2 } + 570 t$