attraction.gd

# You can do this

func _fixed_process(delta):
  var pos_a = get_node("body_a").get_global_pos()
  var pos_b = get_node("body_b").get_global_pos()
  
  # lets say you want to move the body_a to body_b
  var new_pos = pos_a.linear_interpolate(pos_b, delta)
  get_node("body_a").set_global_pos(new_pos)
  
  # linear_interpolate receives the final position and a value between 0 and 1.
  # If its 0 :> returns the starting pos
  # If its 1 :> returns the final pos