The equation y = -16t^2 + 28t + 144 describes the height (in feet) of a ball tossed up in the air at 28 feet per second from a height of 144 feet from the ground. In how many seconds will the ball hit the ground?
+37167 When the ball hits the ground, h will = 0
0 = -16t^2 + 28t + 144 Use quadratic formula to find t .... throw out negative t values
a = -16 b = 28 c = 144
t=−28±√282−4(−16)(144)2(−16)
