Question

difference between uniform velocity and constant velocity

Answer 1

In physics, velocity is the measurement of the rate and direction of changes in position of the object. It is a vector physical quantity; both magnitude and direction are required to define it.
The velocity of the object can be constant if there is no acceleration. In other words, constant velocity is a motion with zero acceleration. Direction and magnitude of velocity are not changed.
"Uniform velocity" means that all material have the same velocity at given moment . The velocity may change its direction or magnitude.