__Chapter 3 Motion In A Straight Line__

Motion along a straight line is also called rectilinear motion.

__Average velocity__: Average velocity is defined as the change in the position or displacement divided the time intervals in which the displacement occurs.

__Average speed__: Average speed is defined as the total path length travelled divided by the total time interval during which the motion has taken place.

__Instantaneous velocity__: The velocity at an instant is known as instantaneous velocity and is defined by the limit of the average velocity as the time interval ∆t becomes infinitesimally small.

__Acceleration__: The average acceleration over a time interval is defined as the change of velocity divided by the time interval.

KINEMATIC EQUATIONS FOR UNIFORMLY ACCELERATED MOTION

- v = v
_{0}+ at - x = v
_{0}t + at^{2} - v
^{2}= v_{0}^{2}+ 2ax