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A 42-kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.7 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.

  • physics -

    KE at beginning: 1/2 m 14^2
    KE at top: 1/2 m 1.7^2

    Ke at beginning=KE at top+PE at top
    1/2 m 14^2=1/2 m 1.7^2 + mgh

    solve for h.

  • physics -

    9.853m

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