Explanation : Displacement-time graph is non-linear. Linear motion (also called rectilinear motion) is motion along a straight line. The linear motion can be of two types : uniform linear motion with constant velocity or zero acceleration; non uniform linear motion with variable velocity or non-zero acceleration. The motion of a particle (a point-like object) along a line can be described by its' position, which varies with (time). An example of linear motion is an athlete running 100 m along a straight track. Linear motion is the most basic of all motion. ....Read more