Motion is the change in position of an object. Understanding distance, speed, velocity, and acceleration is fundamental to describing and predicting h
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Can an object have zero velocity but non-zero acceleration?
Yes. At the highest point of a thrown ball's trajectory, velocity is zero but acceleration due to gravity (10 m/s squared downward) is not zero. The object is momentarily at rest but acceleration is changing velocity instantly after.
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Why is centripetal acceleration always perpendicular to velocity?
Centripetal acceleration changes the direction of velocity, not its magnitude. Since the acceleration is perpendicular to velocity, it does not change speed, only direction, resulting in circular motion.
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How does air resistance affect projectile motion?
Air resistance opposes motion, reducing both horizontal and vertical components of velocity. The trajectory is shorter and lands closer than predicted without air resistance. For accurate calculations, air resistance must be accounted for.
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