Let v(t) be the velocity, in feet per second, of a skydiver at time t seconds, t>0. After her parachute opens, her velocity satisfies the differential eqn

dv/dt = -2v-32,

with initial condition v(0) = -50

b) Terminal velocity is defined as limv(t) as t approaches infinity. Find the terminal velocity of the skydiver to the nearest foot per second

c) It is safe to land when her speed is 20 feet/second. At what time t does she reach this speed?