   Chapter 9.4, Problem 33ES Mathematical Excursions (MindTap C...

4th Edition
Richard N. Aufmann + 3 others
ISBN: 9781305965584

Solutions

Chapter
Section Mathematical Excursions (MindTap C...

4th Edition
Richard N. Aufmann + 3 others
ISBN: 9781305965584
Textbook Problem

Round answers to nearest hundredth where appropriate.Stopping Distance When a driver decides to stop a car, it takes time first for the driver to react and put a foot on the brake, and then it takes additional time for the car to slow down. The total distance traveled during this period of time is called the slopping distance of the car. For some cars, the stopping distance d , in feet, is given by the equation d = 0.05 r 2 + r , where r is the speed of the car in miles per hour.a. Find the distance needed to stop a car traveling at 60 mph.b. If skid marks at an accident site are 75 ft long, how fast was the car traveling?

(a)

To determine

To Find: The distance needed to stop a car travelling at 60 mph.

Explanation

Given:

d=0.05r2+r

Speed of the car (r) = 60mph

Calculation:

d=0.05 (60) 2 +60

d=0

(b)

To determine

To Find: If skid marks at an accident site are 75ft, the speed at which car travelling.

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