Question

distinguish between speed and velocity

Answer 1

Speed =distance/time
Velocity =Displacement /time

Speed is a scalar quantity
Velocity is a vector quantity

Speed cannot be negative
Velocity can be positive, negative or even 0

Answer 2

Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is direction-aware.