SOLUTION: The Height of a projectile above the ground is described by the function P(t)=-16t^2+640t -When will the projectile get back to the ground, height = 0? -When will the project

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Question 766437: The Height of a projectile above the ground is described by the function P(t)=-16t^2+640t
-When will the projectile get back to the ground, height = 0?
-When will the projectile be 3696 feet above ground?

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
The Height of a projectile above the ground is described by the function P(t)=-16t^2+640t
-When will the projectile get back to the ground, height = 0?
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P(t)=-16t^2+640t = 0
Solve for t.
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-When will the projectile be 3696 feet above ground?
P(t)=-16t^2+640t = 3696
Solve for t (might be 2 values, 1 going up, 1 coming down)