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Friction — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsFriction1 Mark
Question
What is the average friction force when a person has a usual 1km walk?
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Answer

Zero.
As $<\vec{\text{a}}>=\frac{\vec{\text{v}}_{\text{f}}-\vec{\text{v}}_{\text{i}}}{\text{t}}=\vec{\text{0}}$ as men starts with zero velocity and ends with zero velocity.

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