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12-08-2017
Mathematics

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A projectile is thrown upward so that its distance above the ground after t seconds is h = -16t2 + 440t.

After how many seconds does it reach its maximum height?

Respuesta :

amirreza688 amirreza688

12-08-2017

find the derivative of h and then find its root
h = -16t^2 + 440t
h'=-32t+440
-32t+440=0
t=13.75 s

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