Using Isaac Newton's Laws of Motion, scientists have demonstrated that ghosts would not be able to walk and pass through walls
In movies such as “Ghostbusters”, ghosts often walk like humans, pass through walls and pick up objects. But
that portrayal cannot be accurate, Efthimiou says. For ghosts to have the ability to walk like humans, they would need to put a force upon the floor, which would exert an equal and opposite force in return.But ghosts' ability to pass through walls and have humans walk right through them demonstrates that they cannot apply any force. LINK
Ghosts, Vampires and Zombies: Cinema Fiction vs Physics Reality. 2006. C.J. Efthimiou, and S. Gandhi.
The Classic "Lonesome Ghosts":
