A 55kg pole vaulter running at 10ms vaults over the bar. if, Ask an Expert

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Q. A 55kg pole vaulter running at 10m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.10m/s and air resistance is disregarded, how high was jump?

Q. Sound does not travel throughout the vacuum of space. Explain why this is true. Go beyond just medium - describe it in terms of vibrations and particles.

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