# SAT Subject Physics Practice Question 155: Answer and Explanation

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**Question: 155**

**1.** For an object traveling in a straight line, its velocity (*v*, in m/s) as a function of time (*t*, in s) is given by the following graph.

Which graph best depicts the object’s momentum?

A.

B.

C.

D.

E.

**Correct Answer:** A

**Explanation:**

Momentum is mass times velocity. Since the mass of the object is just a positive constant, the graph of momentum should have the same shape as the graph of the velocity.