ABSTRACT
The general study of the relationships among displacement, length, and time is called kinematics. Basically, it is a study of the motion of particles and rigid bodies without regard to the forces causing the motion; it deals with displacement, velocity, acceleration, and time and is often referred to as the geometry of motion. Rectilinear motion of a particle is defined as the motion of the particle along a straight path. The instantaneous velocity of the point is defined as the rate of change of its position; its average velocity during the time interval under consideration can be obtained by dividing the displacement by the time interval. When a particle falls under the action of gravity and where the air resistance is negligible, the particle is subject to a constant acceleration.
