Mathematics, 09.04.2021 16:10, supergirl101911

Please help me, I really need help. I don’t understand A waterfall has a height of 900 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 equation h= - 16t^2+ 20t+ 900.

How long after the pebble is thrown will it hit the ground?

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Please help me, I really need help. I don’t understand A waterfall has a height of 900 feet. A pebb...