About 400 yr ago, the physicist Galileo observed that certain projectiles follow a parabolic path ...

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APPLICATION 2.4

Projectile motion

About 400 yr ago, the physicist Galileo observed that certain projectiles follow a parabolic path. For instance, if a cannon fires a shell at a 30 degree angle with a speed of 250 feet per second, then the path of the shell is modeled by the equation ...

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We know this because the leading coefficient (coefficient of the d^2 term) is negative. ...
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