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Differential Equations and Linear Algebra | 3rd Edition | ISBN: 9780136054252 | Authors: C. Henry Edwards, David E. Penney
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A driver involved in an accident claims he was going only

Chapter 1, Problem 44P

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QUESTION:

Problem 44P

A driver involved in an accident claims he was going only 25 mph. When police tested his car, they found that when its brakes were applied at 25 mph, the car skidded only 45 feet before coming to a stop. But the driver’s skid marks at the accident scene measured 210 feet. Assuming the same (constant) deceleration, determine the speed he was actually traveling just prior to the accident.

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QUESTION:

Problem 44P

A driver involved in an accident claims he was going only 25 mph. When police tested his car, they found that when its brakes were applied at 25 mph, the car skidded only 45 feet before coming to a stop. But the driver’s skid marks at the accident scene measured 210 feet. Assuming the same (constant) deceleration, determine the speed he was actually traveling just prior to the accident.

ANSWER:

Solution:

Step 1 of 4:

In this problem, we have to find the speed of the car was actually traveling just prior to the accident.

We have  

Skid distancefinal speed =0 (car stop)

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