Jenna asked in Science & MathematicsPhysics · 8 years ago

# True or false? If you go around a closed track coming back to the same place, during your trip the average spe?

If you go around a closed track coming back to the same place, during your trip the average speed must have been zero.

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• Anonymous
8 years ago

trulse

• 8 years ago

False. The average speed, by definition, is Vavg = S/T = 2piR/T; where S = 2piR is the distance traveled once around the track in T time. R is the radius of the circular track. And S is the circumference.

As you can plainly see 2piR > 0; so Vavg > 0 must be true. Therefore Vavg = 0 is false. QED.

Now having answered your question. I have one for you. What's the average velocity in this case? Hint: It's not the same as the average speed.

• 8 years ago

I do not think so because speed = distance traveled / time

A distance cannot be zero if traveled in any direction.So as going in a track distance have a certain value and it is not reduced in relative to the direction So average speed cannot be zero.