An object is said to be in motion with respect to a frame of reference s1, when its location is changing with time in same frame of reference s1. Rest and motion are relative terms. Absolute rest and absolute motion have no meaning. Motion is broadly classified into 3 categories : 1. Rectilinear and translatory motion. 2. Circular and rotatory motion. 3. Oscillatory and vibratory motion. Rectilinear or 1-D Motion When a particle is moving along a straight line, then its motion is a rectilinear motion. Parameters of rectilinear motion or translatory motion or plane motion: Time It is a scalar quantity and its SI unit is second(s). At a particular instant of time, a physical object can be present at one location only. Time can never decrease. Position or location It is defined with respect to some reference point (origin) of given frame of reference. Consider a particle which moves from location r1 (at time t1) to...