When body is in motion, ____________ always changes?
Correct answer: C. its position vector
- A. its velocity
- B. its acceleration
- C. its position vector
- D. its momentum
Explanation
Motion means a body changes its position with time, so its position vector changes. Velocity, acceleration, and momentum may remain constant in uniform motion, so they do not always change. The likely mistake is choosing velocity, confusing motion with acceleration or changing speed.
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About Displacement and Velocity
Displacement is the directed change in position, while velocity is the rate of change of displacement and includes both magnitude and direction. The topic connects position-time and velocity-time graphs with average and instantaneous values, and distinguishes displacement from distance and velocity from speed.
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