If an average-sized man with a parachute jumps from an airplane, he will fall 12.5(0.2t − 1) + 21t feet in t seconds. How long will it take him to fall 158 feet? (Round your answer to two decimal places.)
Use this formula to solve your problem: D=1/2*g*t^2, where D=distance that the object has fallen, t=time in seconds, g=32 feet/sec^2-being the pull of gravity.
