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The alarm at a fire station rings and a 83-kg fireman, starting from rest, slides down a pole to the floor below (a distance of
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The space probe Deep Space I was launched on October 24, 1998. It's mass was 474 kg. The goal of the mission was to test a new kind of engine called an ion propulsion drive. This engine generated only a weak thrust, but it could do so over long periods of
