SAT Subject Physics Practice Question 387: Answer and Explanation

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Question: 387

8. 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 an equilibrant?

A. The eastward leg
B. The westward leg
C. The northward leg
D. The distance from home
E. The distance to home

Correct Answer: E


The correct answer is (E). The resultant vector is the distance the dog is from home. The opposite of the resultant vector is the equilibrant vector.

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