**Q.No.3.1: - What is the difference between uniform and variable velocity. From the explanation of variable velocity, define acceleration. Give SI units of velocity and acceleration.**

**Ans: -**

__Uniform Velocity: -__

If a body covers equal displacements in equal intervals of time, however small may be, the body is said to have uniform velocity. Its motion is said to be uniform. But be remember that the direction of body all also remain same. If one of them (magnitude or direction) changes then the body will not move with uniform velocity.

__Variable Velocity: -__
If a body covers unequal displacements in equal intervals of time it is said to be moving with variable velocity. If the body is moving in such a way that the magnitude of its velocity is same but its direction is changing then the body is said to be moving with variable velocity.

__Acceleration: -__
Time rate of change of velocity of a body is called acceleration. This means that the velocity is changing, so from the definition of variable velocity we can say that variable velocity is also called acceleration.

__SI Units: -____The SI units of velocity are m/s.__

The SI units of acceleration are ms

^{-2}.
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