SAT Subject Physics Practice Question 584: Answer and Explanation

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Question: 584

10. A dog walks 120 m due east, then turns and runs 60 m west. An interesting smell attracts the dog, and it trots 40 m due north. At this point the dog is 85 m northeast of his home. The dog hears his master call him and he runs directly home. Which part of the trip is the largest 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

Explanation:

The correct answer is (A). The longest leg the dog walked is the eastward vector. The fact that some of the length of the vector was later cancelled when the dog walked in the opposite direction does not change the length of the individual vector.

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