In a test run, a certain car accelerates uniformly from zero to 16.8 m/s in 2.70 s. (a) What is the magnitude of the car's acceleration? m/s² (b) How long does it take the car to change its speed from 8.40 m/s to 16.8 m/s? s (c) Will doubling the time always double the change in speed? O Yes O No
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.
For part (a)
Initial velocity is zero. u = 0
Final velocity, v = 16.8 m/s
Time, t = 2.70 cm
For part (b)
Initial velocity, u = 8.40 m/s
Final velocity, v = 16.8 m/s
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