If time is the x-axis as expected then the x-intercept would be zero movement of the velocity.
velocity
How the speed of something changes over time.
A velocity time graph is still a velocity time graph - no matter the degree of detail that you look at it.
Simply put, a velocity time graph is velocity (m/s) in the Y coordinate and time (s) in the X and a position time graph is distance (m) in the Y coordinate and time (s) in the X if you where to find the slope of a tangent on a distance time graph, it would give you the velocity whereas the slope on a velocity time graph would give you the acceleration.
The velocity of the object at time = 0
If time is the x-axis as expected then the x-intercept would be zero movement of the velocity.
Not necessarily. The graph of instantaneous velocity versus time may or may not have a Y-axis intercept of zero. It depends on the initial conditions and motion of the object. If the object starts from rest, then the initial velocity is zero, and the graph will have a Y-axis intercept at zero.
The velocity at the starting point (when t = 0).
It means that the object was travelling away from or towards the point of reference with a velocity represented by the intercept at the start of the measurement, that is, at time t = 0.
The y-intercept on a position vs. time graph represents the initial position where the object started. It is the value of the position when time is zero.
velocity
Distance covered at a given time.
How the speed of something changes over time.
A velocity time graph is still a velocity time graph - no matter the degree of detail that you look at it.
No, a velocity graph does not indicate where to start. It provides information about the speed and direction of an object's motion at different points in time but does not specify the initial position of the object.
In a displacement-time graph, the gradient represents velocity. In a velocity-time graph, the gradient represents acceleration.