4.11 Accident investigation

Ron's car left four skid marks on the road after he slammed his foot on the brakes to make an emergency stop. The police measured them to be 55ft, 55ft, 62ft and 62ft. What skid distance will be used to calculate his speed?

• 55

• 62

• 60.5

• 58.5

Jaquori's car left three skid marks of 35ft, 38ft and 47ft, what skid distance will be used to determine his speed?

• 40

• 35

• 38

• 47

Rona was driving on the ashpalt road that had a 35mph speed limit posted. A deer jumped out causing Rona to slam on her brakes. She left skid marks of 70ft, 72ft and 71ft. The road had a drag factor of .78. Her brakes were operating at 95% efficiency. What skid mark length did the police use to determine her speed?

• 70

• 71

• 72

• 213

Rona was driving on the ashpalt road that had a 35mph speed limit posted. A deer jumped out causing Rona to slam on her brakes. She left skid marks of 70ft, 72ft and 71ft. The road had a drag factor of .78. Her brakes were operating at 95% efficiency. Does she deserve a ticket? Why?

• Yes, she averaged approximately 45 miles per hour

• Yes, she averaged approximately 40 miles per hour.

• No, she averaged approximately 35 miles per hour.

• No, she averaged approximately 30 miles per hour

Ravi was driving on an ashpalt road when a dog jumped in front of him causing him to slam on his brakes. The road had a drag factor of .75, his brakes were 85% efficient and his two skid marks were 36 and 45 feet. How fast was he going?

• 28.7 mph

• 29.3 mph

• 27.1 mph

• 27.8 mph

A car is traveling at 57mph before it enters into a skid. The drag factor of the road is 1.1 and the braking efficiency is 100%. How long might the average skid mark be to the nearest tenth of a foot?

• 98ft

• 98.5ft

• 99ft

• 99.5ft

Steve is driving at 35 mph when he makes an emergency stop. He leaves four skid marks of equal length. The drag factor of the road is .97 and his brakes were at 90% efficiency. How long might the skid marks be?

• 47ft

• 51ft

• 53ft

• 42ft

Marielle slams on her brakes leaving two skid marks with an average length of 50ft. The lengths were 4 feet apart, what were the two skid mark lengths?

• 50 and 50

• 47 and 51

• 48 and 52

• 49 and 53