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Mathematics 23 Online
OpenStudy (drummmlers):

A waterfall has a height of 1400 feet. A pebble is thrown upward from the top of the falls with an initial velocity of 24 feet per second. The height, h, of the pebble after t seconds is given by the equation h=-16t^2+24t+1400. How long after the pebble is thrown will it hit the ground?

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