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It is easier to roll a barrel full of coal tar...

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

Answer & Solution
Correct Answer: Option B
When a body slides (moves with all its surface area in contact) over another body, the resistance faced is due to sliding friction. Hence rolling friction is less than the sliding friction. Thus it is easier to roll a barrel full of coal tar than to pull it.
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