Two Occupy Wall Street protestors are going for a joy ride in a BMW stolen from a corporate executive. Traveling north on the highway at 40 m/s, they meet a police car traveling south at 20 m/s. The police car can both decelerate and accelerate at 5 m/s² but has to slow to 4 m/s before making a "cop turn" which involves an instantaneous change in direction (but not speed). How long, measured from the time they first met, will it take before the police car can catch up with the protestors and give them a thorough pepper spray down? Answer in seconds.
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.
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