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A rocket has shot in the air with an initial velocity of 800 m/sec. The equation h=-16t (squared)+ 1440t models the height of the ball.

A rocket has shot in the air with an initial velocity of 800 m/sec. The equation h=-16t (squared)+ 1440t models the height of the ball. How long does it take for the rocket to hit the ground. (h=0)

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