It is easier to roll a barrel full of coal tar than to pull it because
  • 1the full weight of the barrel comes into play when it is pulled
  • 2the rolling friction is much less than the sliding friction
  • 3more surface area of the barrel is in contact with the road when it is pulled
  • 4coal tar is a liquid and it flows in the barrel when it is rolled
Answer:- 1
Explanation:-

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