Get rid of the ease in a perspective loop

hi
i have a problem with loop situation
i need to do an animation of a car driving on a road and the buildings go forward against the car and doing a loop back to simulat a moving road.
but the problem is that the buildings animate like there is an “ease”
and there isnt. anytime i try to do this animation
(multiply the buildings, Gruop tham together and in the next keyframe enlarge
them and moving them forward) i get the “ease” effect again,
what can i do to get rid of it?

the file is attached.