Recent content by sTrEsSeD

Thanks you guys! I see, so the trick is to have the initial condition as being opened already.

Homework Statement John the door-stopper man sells and installs door-stoppers. He prides himself as being the world's best stopper and guarantees your money back if you can install a better stopper than him. John's secret to door-stopping is that he remembers from his lectures that the...