During a collision, an 84 kilogram driver of a car moving at 24 meters per second is brought to rest by an inflating air bag in 1.2 seconds. What is the approximate magnitude of the force exerted on the driver by the air bag?
a) 1.7 103 N
b) 8.2 102 N
c) 2.0 103 N
d) 7.0 101 N