mechanism Motion Along a Straight Path

Motion Along a Straight Path
We begin our study of motion with the simplest case, motion in a straight line.

1. Position and displacement along a line
   The first step in the study of motion is to describe the position of a moving object. Consider a car on an east-west stretch of straight highway. We can describe the displacement of the car by saying "the car is 5 kilometers west of the center town". In this description, we specified two factors, the original point of measure and the direction of the displacement.
2. Velocity
   We can define the velocity of an object moving steadily as its displacement per unit time

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