A pebble is hurled upward from the top of a 512-foot-tall building with an initial velocity of 64 feet per second. Neglecting air resistance, the height h(t) in feet of the pebble after t seconds is given by the polynomial function:       a. Find the height of the pebble when t = 1. b. Find the height of the pebble when t = 5.6. c. When will the pebble hit the ground?

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