How Does an Air Bag Cause Deceleration During a Crash?

[hslove24]

Homework Statement

During a test crash, an air bag inflates to stop a dummy's forward motion. The dummy's mass is 75 kg. If the net force on the dummy is 825 N toward the rear of the car, what is the dummy's deceleration?

Homework Equations

w=mg

The Attempt at a Solution

someone help!

 

[Woopy]

that has nothing to do with gravity. F = ma and your given two of them