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Feather Drop 2.wmv - YouTube
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日期：2026-04-23
A feather and ball bearing dropped in air and then in vacuum. Without air resistance, all objects accelerate at the same rate under gravity (9.8m/s/s). This ... ... The Hammer and Feather Experiment - Student Science - Duration: 2:48. by URNScienceShow 22...看更多
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