PLEASE HELP How long will it take until the car's speed drops to 12.0 m/s?

[DrSmiles]

Homework Statement

A 1.54 m wide, 1.48 m high, 1600 kg car hits a very slick patch of ice while going 19.0 m/s. Air resistance is not negligible.
If friction is neglected, how long will it take until the car's speed drops to 12.0 m/s?
To 11.0 m/s?

Homework Equations

Kinematics equations, F=ma


3. solution
I have no idea how to solve this :-(
If you solve it, please explain WHY?

 

[Mattowander]

Draw a free body diagram. What are the forces acting on the car?