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Because the top of the connecting rod


Because the top of the connecting rod swings about the pin and changes direction each time the piston reaches mid-stroke, the relative speed between bearing and pin at mid-stroke is zero, ()to a maximum as the piston approaches top or bottom dead center and then () back to zero again as the piston approaches mid-stroke and the connecting rod changes direction.

  • Aaccelerates;decelerates
  • Baccelerates;accelerates
  • Cdecelerates;decelerates
  • Ddecelerates;accelerate
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