You testify as an expert witness in a case involving an accidentin which car A slid into the rear of car B, which was stopped ata red light along a road headed down a hill. You findthat the slope of the hill is u = 12.0, that the cars were separatedby distance d =24.0 m when the driver of car A put the car into aslide (it lacked any automatic anti-brake-lock system), and that thespeed of car A at the onset of braking was v0 =18.0 m/s.With whatspeed did car A hit car B if the coefficient of kinetic friction was(a) 0.60 (dry road surface) and (b) 0.10 (road surface covered withwet leaves)?
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.
You testify as an expert witness in a case involving an accident
in which car A slid into the rear of car B, which was stopped at
a red light along a road headed down a hill. You find
that the slope of the hill is u = 12.0, that the cars were separated
by distance d =24.0 m when the driver of car A put the car into a
slide (it lacked any automatic anti-brake-lock system), and that the
speed of car A at the onset of braking was v0 =18.0 m/s.With what
speed did car A hit car B if the coefficient of kinetic friction was
(a) 0.60 (dry road surface) and (b) 0.10 (road surface covered with
wet leaves)?
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