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Solve problem.(Modeling) Height of a Projectile A projectile is launched straight up from...

Solve problem.

(Modeling) Height of a Projectile A projectile is launched straight up from ground level with an initial velocity of 96 ft per sec. Its height in feet, s, after t seconds is given by the equation

(a) At what time(s) will it reach a height of 80 ft?
(b) After how many seconds will it return to the ground?

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