SAT Subject Physics Practice Question 388: Answer and Explanation
9. A dog walks 120 m due east before turning and running 45 m west. He then turns and trots 40 m due north. After completing his journey, he is 85 m northeast of his home. When he hears his master call him, he runs directly home.
Which part of the trip is the longest vector?
A. The eastward leg
B. The westward leg
C. The northward leg
D. The distance from home
E. The distance to home
Correct Answer: A
The correct answer is (A). The numerical value is the magnitude of the vector. The one with the largest numerical value is the longest vector.