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Discussion

It is easier to roll a barrel full of coal tar than to pull it because

  • A.The full weight of the barrel comes into play when it is pulled
  • B.The rolling friction is much less than the sliding friction
  • C.More surface area of the barrel is in contact with the road when it is pulled
  • D.Coal tar is a liquid and it flows in the barrel when it is rolled

Answer: B

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