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Projectile motion-Two dimensional motion

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When a ball is thrown vertically upward, its height (h, in feet) above the ground after t seconds is described by the mathematical formula h = - 16t2 + 96t + 80. At what times is the ball 103 feet above the ground?

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When a ball is thrown vertically upward, its height (h, in feet) above the ground after t seconds is described by the ...

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