Apply quadratic functions to physical situations such as projectile motion under gravity.
Find when a projectile reaches the ground
Problem
Find when projectile \(h(t)=-16t^2+64t\) reaches the ground.
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What this problem is really about
Reaching the ground translates to an output condition, so we begin by setting the height equal to zero. We’ll solve for every intercept time, then use the flight context to distinguish the launch instant from the later return to ground level.
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