Question

To practice pole-vaulting, a 55kg pole-vaulter falls off a wall from 8.0m above the ground. A 2.0m thick foam cushion is resting on the ground; however, he misses the cushion. The pole-vaulter sinks about .10m into the ground before stopping. What is the speed of the pole-vaulter when he hits the ground? What is the impulse exerted on the pole-vaulter by the ground as he comes to rest? What is the force exerted on the pole-vaulter by the ground as he comes to rest?

Answer 1

Concept - find the speed just before hitting the ground using equation of kinematics to find the required impulse as shown below. Use Newton’s law of motion to find the force exerted by the ground.

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