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![h_{B} = \frac{[(11\,\frac{m}{s} )^{2}-(1.3\,\frac{m}{s} )^{2}]}{2\cdot (9.807\,\frac{m}{s^{2}} )}](/tpl/images/0540/4687/b6351.png)
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A 70-kg pole vaulter running at 11 m/s vaults over the bar. Her speed when she is above the bar is 1...
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