SAT Subject Physics Practice Question 344: Answer and Explanation

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Question: 344


A boxcar rolls down an incline and strikes a stationary boxcar at the bottom of the incline. The two boxcars stick ogether and roll a short distance before they come to a stop. Which of the graphs above shows the total momentum of both boxcars throughout the time they are moving?

A. Time A
B. Time B
C. Time C
D. Time D
E. Time E

Correct Answer: E


The correct answer is (E). The momentum of the boxcars increases and then decreases as the velocity does the same. The velocity increases and decreases in a linear manner.

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