In a distance-time graph, if the curve is NOT a straight line, then it represents _______.
non-uniform speed
The slope of a distance-time graph gives the speed of the object. A straight line has the same slope everywhere, so it shows that equal distances are covered in equal intervals of time.
If the graph is a curve, its slope keeps changing, so the object covers unequal distances in equal intervals of time. So a curved distance-time graph represents non-uniform speed.
Uniform speed and motion with zero acceleration both give a straight sloping line, and an object at rest gives a straight line parallel to the time axis. None of these produces a curve.
Hence, non-uniform speed.
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Important Questions from Motion
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Momentum of a given body is doubled. Its kinetic energy becomes (mass not changed)
