🚓 Police Exams: Matric Science, Maths, Law & Hindi LiteratureUP, Bihar and Delhi Police recruitment boards

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Try a real Police Exams: Matric Science, Maths, Law & Hindi Literature question

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From the chapter: Motion, Force, Gravitation, Work and Energy

A runner completes exactly one lap of a 400 m circular track in 80 s and stops at the starting point. What are the runner's average speed and average velocity for the lap?

Show the answer and why

Answer: C.

Average speed is distance over time: 400 / 80 = 5 m/s. Displacement is zero because start and end coincide, so average velocity is 0. The tempting 5 m/s for both treats velocity as if it were speed; speed is never zero here because the runner moved.

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