Question: please help PHYSICS 1 1 / 20 WCLN.ca 10. A pole-vaulter of mass 75 kg reaches a maximum speed of 7 m/s just before he

please help

PHYSICS 1 1 / 20 WCLN.ca 10. A pole-vaulter of mass 75 kg reaches a maximum speed of 7 m/s just before he jams his pole into the notch to launch himself over the bar. Assuming that his pole is only 80% efficient, what is the maximum height that the pole-vaulter can reach

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