On July 31, 1994, Sergei Bubka pole-vaulted over a height of 6.14 m. If his body was momentarily at rest at the top of the leap, and all of the energy required to raise his body derived from his kinetic energy just prior to planting his pole, how fast was he moving just before takeoff? Neglect the mass of the pole. If he could maintain that speed for a 100-m sprint, how fast would he cover that distance? Since the world record for the 100-m dash is just over 9.8 s, what do you conclude about world-class pole- vaulters?