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.

Question

Physics

Elliot Dorsey

29 April, 18:37

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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Answers (2)

Know the Answer?

Mango · Answer 1

Answer: 5.05 m

Michael Bush · Answer 2

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