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A man walks over a rough surface, the angle between the force of friction and the instantaneous velocity of the person is
a)p
b)p/2
c)p/4
d)zero
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
A man walks over a rough surface, the angle between the force of frict...
When a man walks on a rough surface, it is the frictional force which is responsible for motion, i.e, required angle between frictional force and instantaneous velocity is zero. 
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Most Upvoted Answer
A man walks over a rough surface, the angle between the force of frict...
Explanation:
Frictional force always acts in a direction opposite to the direction of motion. In this case, the man is walking over a rough surface, so the frictional force will act in a direction opposite to the direction of his motion.

Analysis:
- The angle between the force of friction and the instantaneous velocity of the person is zero because they are in opposite directions.
- When two vectors are in opposite directions, the angle between them is 0 degrees.

Conclusion:
Therefore, the correct answer is option 'D' - zero.
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A man walks over a rough surface, the angle between the force of friction and the instantaneous velocity of the person isa)pb)p/2c)p/4d)zeroCorrect answer is option 'D'. Can you explain this answer?
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