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A projectile is thrown upward so that its distance above the ground after t seconds is h = -16t2 672t. after how many seconds does it reach its maximum height?
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A projectile is thrown upward so that its distance above the ground after t seconds is h = -16t2 672t. after how many seconds does it reach its maximum height?

User Karyl
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42 would be when the ball hits the ground again, 21 would be when it's at its maximum.
User MrHill
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