A horizontal line in a displacement-time graph represents:
Correct answer: D. Body at rest
- A. Uniform accelerated motion
- B. Motion with constant velocity
- C. Motion with constant speed
- D. Body at rest
Explanation
A horizontal line on a displacement-time graph shows that the object is stationary (not moving because the displacement doesn't change with time). Note that the slope/gradient of a displacement-time graph = velocity. Since the gradient of a straight line is 0, the velocity is 0 and the body is at rest.
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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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