Assertion :A disc is rolling on a rough horizontal surface . the instantaneous speed of the point of contact during perfect rolling zero with respect to the ground. Reason: the force of friction can help in achieving pure rolling conditions
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion Velocity of point of contact
V=(VCM−ωR)
When pure rolling occurs VCM=ωR Hence , V=0
also frictional force can provide torque which further helps in achieving the pure rolling condition