If you jump as a falling elevator hits the bottom will you be saved?

No, because you wouldn't know when the elevator was going to hit the shaft.

However, if you're ever in this situation scientists believe the best way to survive is by lying flat on your stomach in the centre of the lift. Put your arm over your head and face to shield yourself from debris. There's 2reasons why this method is good.

1. When the lift hits the bottom the chances of it falling apart are high

2. Being flat might mean you sustain injuries but the chance of it being fatal is less because you're spread over a larger surface area than if you were standing - and the chances of you being able to stand and jump against the huge gravity pressing down on you are very slim.