An object moves with uniform velocity when its speed remains constant, and its direction of motion remains constant as well. In other words, the object moves in a straight line at a constant speed.
For an object moving in a straight line, the angle of its motion can be defined with respect to a reference direction. The angle is typically measured with respect to the positive x-axis or any other chosen reference direction.
When an object moves in a straight line with uniform velocity, the angle of its motion is 0 degrees or 180 degrees with respect to the reference direction. This means the object is either moving directly in the positive direction of the reference axis (0 degrees) or in the negative direction opposite to the reference axis (180 degrees).
To summarize, an object moving with uniform velocity moves in a straight line, and the angle of its motion is either 0 degrees or 180 degrees with respect to a chosen reference direction.