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Question
It is easier to roll a barrel full of coal tar than to pull it because
Options:
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: Option B

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