Motion
A more steeply inclined distance-time graph indicates greater speed. The nature of distance-time graph is a curve having varying slope when the object has non-uniform motion.
If the velocity of a body remains constant, the velocity-time graph is a horizontal line parallel to the time axis.
If the velocity of the body changes uniformly at a constant rate, the velocity-time graph is a straight line.
If the velocity of the object changes non-uniformly, the velocity-time graph is a curve having increasing slope.
The area enclosed by the velocity-time graph and the time axis represents the displacement.
The slope of the velocity-time graph gives the acceleration
When a body travels along a circular path of constant radius with a constant speed v then its motion is uniform circular motion.
In a uniform circular motion, velocity of a particle is not constant but its speed is constant, hence it is an accelerated motion.
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NCERT 9 Science