Question

A 45-kg pole vaulter running at 10 m/s vaults over the bar. Her speed when she is above the bar is 1.1 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.
_______m

Answer 1

The altitude or height of the pole vaulter as she crosses the bar is 4.04 m.

What is the height of the pole vaulter?

The height of the pole vaulter is determined from the change in kinetic energy which is equal to the potential energy at that height.

• Potential energy = Change in kinetic energy

• mgh = m(v - u)²/2

h = (v - u)²/2g

h = (10 - 1.1)²/2 * 9.8

h = 4.04 m.

In conclusion, the height is determined from the potential energy at that height.

Learn  more about potential energy at: brainly.com/question/14427111

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