The following can be said about the nature of motion of a body, if its displacement-time graph is as follows — (a) A straight line parallel to time axis — shows that the body is stationary (or no motion). (b) A straight line inclined to the time axis with an acute angle — shows the linear relationship between the displacement and time (i.e., the body travels equal distance in equal intervals of time in a certain direction). Hence, we can say the motion is away from the starting point with uniform velocity. (c) A straight line inclined to the time axis with an obtuse angle — shows that there is motion towards the starting point with a uniform velocity. (d) A curve — shows that the body moves with varying speed in a fixed direction. Hence, we can say that there is motion with variable velocity.
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