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A car moving forward with a backward-pointing acceleration is undergoing:
ADeceleration
BA free-fall
CUniform motion
DCircular motion
Answer & Solution
Correct answer: A. Deceleration
1. The relative directions of velocity and acceleration set the label.
2. Acceleration is a vector with its own direction.
3. Deceleration always refers to acceleration in the direction opposite to the velocity.
4. Here the velocity points forward and the acceleration points backward.
5. So the car is decelerating.
_Source: OpenStax College Physics for AP Courses 2e (CC BY 4.0), Ch 2 'Kinematics', sections 2.1-2.8_
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