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Another important aspect of motion is acceleration, which refers to a change in velocity. When an object exhibits uniform motion, the velocity remains a constant, i.e., the change in velocity (acceleration) is zero.


Whenever a moving object exhibits non-uniform motion and increases its speed, we say it is accelerating. Here velocity varies with time.

Example : If a car starts from rest and speeds up to 60 kmh-1, it is said to be accelerating. If a second car, also starting from rest, speeds to 60 kmh-1 in less time than the first, it is said to undergo greater acceleration than the first.



Acceleration is defined as the rate of change of velocity

In other words, acceleration is the change in velocity divided by the time required to make that change. Or Acceleration = change in velocity/time

a = (v – u) / t

The motion of a freely falling body is an example of accelerated motion.

Velocity is a vector and time is a scalar, their ratio.


Example : Acceleration, is a vector. It has both magnitude as well as direction, the direction being that of the velocity.


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