Assertion :When a person walks on a rough surface, the frictional force exerted by surface on the person is opposite to the direction of his motion. Reason: It is the force exerted by the road on the person that causes the motion.
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
Assertion is incorrect but Reason is correct
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Solution
The correct option is D Assertion is incorrect but Reason is correct When a person walks, he pushes the ground backwards and in turn ground applies a forward frictional force to help him move. Thus statement 1 is incorrect as this force acts in same direction as the motion. Reason is correct as explained above.