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Pole vault athletes, jump over the bar from the beginning the process of conservation of mechanical
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CYTYLZCJS8888
2010-01-30 03:01:54 +0000
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Country JS
2010-01-30 03:07:03 +0000
#2
Select A person doing work to overcome the resistance, the sum of mechanical energy to reduce a person's mechanical energy is not conserved.
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