Factoring Application - Find the Time When a Projectile Hits and Ground

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This video explains how to determine when I projectile hits the ground and when it is at a given height.
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the gravitational force of the earth is either 32ft/sec^2 or 9.8m/sec^2. how come that the coefficient of x^2 is -3???

arnelferriol
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Here from the digital backpack 256 check

jpdavis