A projectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = - 16t2 + 576t. After how many seconds does the projectile take to reach its maximum height? Show your work for full credit.
i don't even understand what she is wanting me to do??????????

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How ois the Physics question posted here @.Sam.

math books have these types of questions as well

its asking you for the vertex of the parabola

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