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A projectile is thrown upward so that its distance above the ground after t seconds is given by the function h(t) = -16t2 + 704t. After how many seconds does the projectile take to reach its maximum height?

User Ivnhal
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1 Answer

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You need to find the x-coordinate (h) of the vertex of the parabola.


-16t^2+704t=0\\ h=-(b)/(2a)=-(704)/(2\cdot(-16))=22

After 22 seconds.