Dr. B takes her dog ada on a walk. they start out heading south for 0.75 miles. then they turn left 30 degrees and they continue to walk for another 11 mile. Finally they turn right 9o degrees and they walk 1.9 miles. The whole walk takes 45 minutes.  What is the average speed of Dr.B and Ada on their walk? give your answer in m/s. What is the direction of the total displacement vector?

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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Dr. B takes her dog ada on a walk. they start out heading south for 0.75 miles. then they turn left 30 degrees and they continue to walk for another 11 mile. Finally they turn right 9o degrees and they walk 1.9 miles. The whole walk takes 45 minutes. 

What is the average speed of Dr.B and Ada on their walk? give your answer in m/s.

What is the direction of the total displacement vector? 

Expert Solution
Step 1 Introduction

The displacement is a vector quantity that means it has both magnitudes as well as the direction. It is defined as the rate if a change of the position of the object. It is equal to the distance when the displacement is in a straight line throughout its motion. 

The average velocity is the ratio of total distance travelled in total time taken. It is a scalar quantity as it doesn't depend upon the mass. Moreover, the average velocity is equal to the magnitude of average velocity if the veocity doesn't change direction. 

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