The displacement versus time graph for a body moving in a straight line is shown in the figure. Which of the following regions represents the motion when no force is acting on the body?
Correct answer: C. bc
- A. ab
- B. cd
- C. bc
- D. de
Explanation
The following is the solution:The slope of displacement versus time graph gives the velocity. This is constant here only for the portion bc, as the graph is a straight line under this section. Constant velocity means no acceleration and no acceleration means no force acting on the body.
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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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