You are driving your car on a straight road with a coefficient of friction between the tires and the road of 0.61. A large piece of debris falls in front of your view and you immediately slam on the brakes, leaving a skid mark of 20.8 m (68.2 feet) long before coming to a stop. A policeman sees your car stopped on the road, looks at the skid mark, and gives you a ticket for traveling over the 17.9 m/s (40 mph) speed limit. Will you win if you fight the speeding ticket in court?By what margin of speed (in m/s) were you traveling over or under the speed limit?