AP PHYSICS 1 Kinematics falling with deceleration

[pow]

Homework Statement

Captain American bails out of an airplane and falls 50 meters without friction. When the parachute opens, he decelerate at 2.0m/s². He reaches the ground with a speed of 3.0 meters/sec.
a.) How long is captain america in the air?

d_o=
d=
v_o=
v=3m/s
t= ?
a= -9.8m/s² ?? (this is where I am confused because of the deceleration of 2.0m/s².

Homework Equations

d=d_o + V_o +1/2at²

The Attempt at a Solution

 

[kuruman]

This problem comes in two parts. Part 1 constant acceleration down at 9.8 m/s². Part 2 constant acceleration up at 2 m/s².