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7. A 50 kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is over the bar is 1.0 m/s. Neglect air resistance, as wel
Question
7. A 50 kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is over the bar is 1.0 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her height as she crosses the bar.
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Physics
3 years
2021-08-19T04:09:01+00:00
2021-08-19T04:09:01+00:00 2 Answers
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Answers ( )
Answer:
5.1 m
Explanation:
Initial kinetic energy = final kinetic energy + final potential energy
KE = KE + PE
½ mv² = ½ mv² + mgh
½ v² = ½ v² + gh
½ (10 m/s)² = ½ (1.0 m/s)² + (9.8 m/s²) h
h = 5.1 m
Answer: 5.05 m
Explanation: