Distinguish between uniform and non-uniform acceleration.

A force of $100 \mathrm{N}$ acts on a body so that the body acquire a velocity of $10 {\mathrm{ms}}^{-1}$ after some time. Now the force of $100 \mathrm{N}$ is replaced by another force F which decelerates the body and body come to the rest then.

A body starts from rest is accelerated uniformly for 30s. If x1, x2, x3 are the distances travelled in first 10s; next 10s and last 10s respectively, then x1 : x2 : x3 is

In the above graph what is the value of acceleration? 

Name the physical quantity which causes acceleration to be non-uniform.

What do you understand by the term acceleration? When is acceleration positive and when is it negative? State the units of acceleration in SI system.