Question

what is the difference between velocity and acceleration.

Answer 1

Speed has no direction while velocity does. For example, if I say that I'm running at 10 mph, I have given you my speed. If I say that I'm running 10 mph north, then I have given you my velocity. Acceleration is the rate of change in velocity.

Answer 2

velocity is the speed with direction
acceleration is change in velocity
v=d/t
a=v-u/t