SAT Subject Physics Practice Question 2: Answer and Explanation

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Question: 2

2. At time t = t1, an object’s velocity is given by the vector v1 shown below.

A short time later, at t = t2, the object’s velocity is the vector v2.

If v1 and v2 have the same magnitude, which one of the following vectors best illustrates the object’s average acceleration between t = t1 and t = t2 ?

A.
B.
C.
D.
E.

Correct Answer: C

Explanation:

By definition, = ∆v / ∆t. We determine ∆v = v2v1 = v2 + (–v1) geometrically as follows:

Since ∆t is a positive scalar, the direction of is the same as the direction of ∆v, which is displayed above; C is best.

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