SAT Subject Physics Practice Question 373: Answer and Explanation

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Question: 373

69. Two equal vectors V and V' are added together. All of the following are possible values for the magnitude of the resultant vector EXCEPT

A. 0
B. 1/4 V
C. 1/2 V
D. 2 V
E. 4 V

Correct Answer: E


The correct answer is (E). For any value of the vector V and V , they are equal in magnitude to one another. Whether they act in the same or opposite directions from one another, all the choices are possible except the value of 4 times V.

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