The world's longest waterslide!

to get a successful landing, the stuntman must consider his initial gravitational potential energy. How much that gravitational potential energy will convert to kinetic energy after consideration of energy required to overcome frictional force as well as his launch speed. (Recall that kinetic energy is dependent on speed of moving object).

Also the distance from edge of slide to his target and time he will remain airborne.

A wrong calculation will result in a tragedy. But the right one will result in pure awesomeness :)

So this is ONE reason why the topic of Distance, Speed, Time is very important :)