Solve the problem. Round to the nearest tenth, if necessary. A rock falls from a tower that is 432 feet high. As it is falling, its height is given by the formula h = 432 - 16t2. How many seconds will it take for the rock to hit the ground (h=0)?

Answer 1

0 = 432 - 16 t^2
t^2 = 432/16
t = (1/4) sqrt (16*27)
t = sqrt 27 which is about 5.2 seconds