A 50-kg driver sits in her car waiting for the traffic light to change. Another car hits

Question:

A 50-kg driver sits in her car waiting for the traffic light to change. Another car hits her from behind in a head-on, rear-end collision and her car suddenly receives an acceleration of 16 m/s2. If all of this takes place in 0.25 s,
(a) What is the impulse on the driver?
(b) What is the average force exerted on the driver, and what exerts this force?