Which of the following changes when a particle is moving with uniform velocity?
Correct answer: D. position vector
- A. speed
- B. acceleration
- C. velocity
- D. position vector
Explanation
When a particle moves with uniform velocity, its speed, acceleration, and velocity remain constant. However, its position vector changes with time as it moves in a straight line.Incorrect Options Explanation:(a) speed: Speed remains constant for uniform velocity.(b) acceleration: Acceleration is zero for uniform velocity.(c) velocity: Velocity remains constant for uniform velocity.
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Displacement, velocity and acceleration describe motion, including the horizontal and vertical components of projectile motion. The chapter connects these quantities with Newton's laws, momentum and impulse, then applies conservation of momentum to collisions, distinguishing elastic collisions from inelastic ones.
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