x Person 2 Person 1 (a) Person 1 is moving at constant speed all the time. Person 2 is slowing down all the time. (b) Person 1 is at rest all the time. Person 2 is initially slowing down, then starts to speed up. (c) Person 1 is moving at constant speed all the time. Person 2 is initially speeding up, then starts to slow down. (d) Person 1 is at rest. Person 2 is speeding up all the time. (e) Not enough information from the plots to infer the nature of the motion of each person.
Displacement, Velocity and Acceleration
In classical mechanics, kinematics deals with the motion of a particle. It deals only with the position, velocity, acceleration, and displacement of a particle. It has no concern about the source of motion.
Linear Displacement
The term "displacement" refers to when something shifts away from its original "location," and "linear" refers to a straight line. As a result, “Linear Displacement” can be described as the movement of an object in a straight line along a single axis, for example, from side to side or up and down. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Non-contact sensors such as LVDTs and other linear location sensors can calculate linear displacement. Linear displacement is usually measured in millimeters or inches and may be positive or negative.
The trajectories of Person 1 and Person 2 are drawn versus time in the figure below. Which of the following(s) is(are) true?
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