dampen=0.5
speed=6
restpos=workspace.Part.Position
pos=restpos
vel=Vector3.new(0,0,100)

while true do
	restpos = workspace.Part.Position
	local dt=wait()/speed
	local accel=restpos-pos-2*dampen*vel
	vel=vel+dt*accel
	pos=pos+dt*vel
	workspace.MovePart.Position = pos
end

This script works nicely (credit to AxisAngle), but only for positioning. It would be nice to know how to use this with CFrames, but the same operators that apply to Vector3 don't always apply to CFrame.

Thus a moderate rewrite is in order. I'm not really sure how to incorporate the rotation matrix.

AnonymousEdited