After an accident, police can estimate the speed that a car was traveling by measuring its skid marks. The formula v=2 √5L can be used where v is the speed, in miles per hour, and L is the length of the skid marks, in feet. (a) Estimate the speed of a car that left skid marks 180

After an accident, police can estimate the speed that a car was traveling by measuring its skid marks. The formula v=2 √5L can be used where v is the speed, in miles per hour, and L is the length of the skid marks, in feet. (a) Estimate the speed of a car that left skid marks 180

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter1: Getting Started

Section: Chapter Questions

Problem 5PQ

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Question

After an accident, police can estimate the speed that a car was traveling by measuring its skid marks. The formula

v=2 √5L

can be used where v is the speed, in miles per hour, and L is the length of the skid marks, in feet.

(a) Estimate the speed of a car that left skid marks

180

ft long.

(b) If the posted speed limit is 50 mph should the police officer believe the driver's claim that he was not speeding?

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