Acceleration is defined as the ratio of change in velocity and the corresponding time interval.

### Average Acceleration

It is defined as the change in velocity (∆v) divided by the corresponding time interval (∆t).

### Instantaneous Acceleration

It is defined as the limiting value of the average acceleration as the time interval approaches to zero.

## Motion In A Plane With Constant Acceleration

A body is said to be moving with uniform acceleration, if its velocity vector surfers the same change in the same interval of time.

Let an object is moving in x-y plane and its acceleration a is constant. At time t=0, the velocity of an object be v₀ and v be the velocity at time t.

According to definition of average acceleration-

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