At low altitudes, the altitude of a parachutist and time in the air are linearly related. A jump at 2,880 ft using the U.S. Army’s T-10 parachute system lasts 120 secs.
(A) Find a linear model relating altitude a (in feet) and time in the air t (in seconds).
(B) Find the rate of descent for a T-10 system.
(C) Find the speed of the parachutist at landing.