SAT Subject Physics Practice Question 529: Answer and Explanation

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Question: 529

15. An object is thrown from a moving vehicle. Which of the following statements is not true?

I. The velocity of the object changes.

II. The acceleration of the object changes.

III. The direction of motion of the object changes.

A. I only
B. II only
C. I and III only
D. II and III only
E. I, II, and III

Correct Answer: B


The correct answer is (B). When the object leaves the hand of the person who throws it out of the vehicle, the object is in free fall. The acceleration of any object in free fall is a constant 9.8 m/s2, therefore the acceleration does not change. Since there is acceleration, however, the velocity will change.

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