The equation y = -6t^2 - 5t + 56 describes the height (in feet) of a ball thrown downward at 5 feet per second from a height of 56 feet from the surface from Mars. In how many seconds will the ball hit the ground? Express your answer as a decimal rounded to the nearest hundredth.
+37159 h = 0 when the ball hits the surface, sooooo
0 = -6t^2 -5t+56 use quadratic formula a = -6 b = -5 c = 56
to find t = 2.67 sec or t = - 3.5 (throw out)
