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Old 14th July 2018 | 11:08
  #92 (permalink)  
Chu Chu
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Joined: Feb 2009
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From: Virginia
If I'm walking down the side of the road, I can calculate my kinetic energy relative to the ground surface, or relative to the truck that's coming the other way. It's only the first that matters . . . unless I step in front of the truck.
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