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Question 35 of 36

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SAT Subject Test

A piece of chalk is thrown vertically upward and caught during its descent at the same height from which it was thrown. The position of the chalk is measured from when it left the hand. The positive direction for position, velocity, and acceleration is upward.

What are the signs of the position, velocity, and acceleration during the ascending part of the trajectory?

  Position Velocity Acceleration
(A) Positive Positive Positive
(B) Positive Positive Negative
(C) Positive Negative Negative
(D) Negative Positive Negative
(E) Negative Negative Negative

 

Select an Answer

(A)

Correct Answer: 
No

(B)

Correct Answer: 
Yes

(C)

Correct Answer: 
No

(D)

Correct Answer: 
No

(E)

Correct Answer: 
No

The correct answer is positive position, positive velocity, and negative acceleration. As the chalk ascends, its position is above the point of release at the hand so it is positive. The chalk is moving upward so its velocity is positive. The gravitational force is downward, so the acceleration of the chalk is also downward and therefore negative.

Question Difficulty: 
hard