Linear Interpolation issues (acceleration and deceleration)?

:information_source: Attention Topic was automatically imported from the old Question2Answer platform.
:bust_in_silhouette: Asked By Gamepro5

This video illustrates the problems.

To try to describe them, basically when I put linear interpolation code for adding acceleration and deceleration to already working code several things break. After months of trying and giving up, I cant do this anymore and will require help. The project’s code can be found open source here.

(It’s a modified version of this)