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A waterfall has a height of 1500 feet. A pebble is thrown upward from the...

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A waterfall has a height of 1500 feet. A pebble is thrown upward from the top of the falls with an initial velocity of 20 feet per second. The height, h, of the pebble after t seconds is given by the equationh=-16t+20t+1500. How long after the pebble is thrown will it hit the ground?seconds after it is thrown.The pebble will hit the ground about

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