Question: A pole vaulter can clear a bar set at a height of 5m.
1. By what factor should he increase the speed of his approach if he hopes to gain entry to the prestigious Six Meter Club?
2. In reality a vaulter who runs at 9.5 m s-1 can clear a 6 m bar.
a. Compare his kinetic energy while running to his gravitational potential energy at 6 m height.
b. Give several reasons why this experimental observation does not violate energy conservation.