Rutherford gold experiment

When an alpha particle is nearing the gold atoms nucleus, it is slowing down due to electrostatic repulsion, right? But then why is the acceleration or velocity not a minimum at that point (the point where the alpha particle reverses its direction)and why is the speed a minimum? Like isn't the resultant force on the alpha particle reducing which should cause its acceleration to be minimum?

When something changes direction, the velocity vector changes direction. Therefore, at the point of changing directions the velocity is $$0$$.