When you are zoomed in, you are effectively compressing space/distance, thus the object has to move a much shorter distance, making its movement appear faster since it has less distance to travel.
This is not the same thing, but…when you use your computer’s “mouse speed” settings, the “slow” setting seems to take forever to move your cursor from one point on your screen to the next – that, though a different thing, is still representative of a subject moving across your lens on wide or normal angle; set your mouse speed to “faster” or “fastest” and until you adjust to the difference you almost lose control of the cursor as it zips across the screen with the slightest movement of your mouse – that, though I will repeat being a different thing, is still representative of a subject moving across lens field of view on telephoto or “zoomed in.”
Different apples, same oranges.
