Concept explainers
Mitwaukee is 121 mi (air miles) due west of Grand Rapids. Maria drives 255 mi in 4.75 h from Grand Rapids to Mitwaukee around Lake Michigan. Find (a) her average driving speed and (b) her average travel velocity.
(a)
Find the average driving speed of the person.
Answer to Problem 21P
The average driving speed of the person is
Explanation of Solution
Given data:
The distance travelled by the person
The time taken by the person to travel the given distance
Formula used:
Write the expression to find the average velocity in terms of distance and duration as follows.
Here,
Calculation of average driving speed of the person
Substitute 255 mi for
Conclusion:
Thus, the average driving speed of the person is
(b)
Find the average travel velocity of the person.
Answer to Problem 21P
The average travel velocity of the person is
Explanation of Solution
Given data:
The travel distance
The time duration to travel the given distance
Calculation of average travelvelocity of the person
Substitute 121 mi for
As the given displacement is in the direction of west, the direction of obtained velocity is in the west direction.
Conclusion:
Thus, theaverage travel velocity of the person is
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