Average velocity of track runner

Classical Mechanics Level 1

It takes 50 50 seconds for a runner to turn a complete circle a 400 400 m track. What is the magnitude of the average speed of the runner?

4 m/s 0 m/s 2 m/s 8 m/s

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Lakshan Dumpa by Lakshan Dumpa , 24, India

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4 solutions

Its because net displacement is zero so there could be no average velocity

5 Helpful 0 Interesting 0 Brilliant 0 Confused

I don't understand, the question clearly asks for average speed. Why is everyone talking about averge velocity? Average velocity may be 0 but average speed is 8m/s. The answer should be 8m/s

Priontu Chowdhury - 6 years, 4 months ago

Semantics?

Guiseppi Butel - 7 years ago

Excuse me , please change your answer

Rama Devi - 6 years ago
Astro Enthusiast
Jun 27, 2014

When an object is moving in a circular path, its average velocity is zero.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

Yes, But not always. Your statement is only true if the object covers a distance of n 2 P i r n2Pi r , where n is an integer, Or it covers full circles. If it covers a half a circle or any distance instead of n 2 P i r n2Pi r , then it's average velocity can't be zero:)

A Former Brilliant Member - 6 years, 11 months ago

The question asked for average speed and not velocity

Rama Devi - 6 years ago

Excuse me , please change your answer

Rama Devi - 6 years ago
Cyd Redelosa
Jun 19, 2014

My understanding why my answer is 0 m/s :

The question never stated that he ran :)

1 Helpful 0 Interesting 0 Brilliant 0 Confused

the question asked for average speed and not velocity

Rama Devi - 6 years ago

Excuse me , please change your answer

Rama Devi - 6 years ago
Shivamani Patil
Jun 7, 2014

One complete round means initial and final positions are same therefore displacement is 0 and therefore velocity.

1 Helpful 0 Interesting 0 Brilliant 0 Confused

The question asked for average speed and not velocity

Rama Devi - 6 years ago

Excuse me , please change your answer

Rama Devi - 6 years ago

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