2. A driver has an accident when travelling on a street with a speed limit of 20 miles per hour. The police measure skid marks 21 feet long. a. When the accident occurred, the road was dry and the road surface was normal. The police officer uses 0.7 for the coefficient of friction. Was the driver speeding? Show how you got your answer. b. When the accident occurred, the road was wet and the road surface was oily. The police officer uses 0.4 for the coefficient of friction. Was the driver speeding? Show how you got your answer.