Find what's the Speed of a Cyclist

Classical Mechanics Level 1

If a cyclist in the Tour de France traveled southwest a distance of 12,250 meters in one hour, what would the velocity of the cyclist be (in m/s) to 2 decimal places?


The answer is 3.40.

Rahul Parmar by RAHUL PARMAR , 22, India

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2 solutions

Mehul Arora
Oct 25, 2014

To convert a Speed from Km/h Into m/s we multiply the speed in km/h by 5/18.

And 1 km= 1000m. Hence the cyclist is travelling at a speed of 12.25 Km/h.

Hence,The speed in m/s= 12.25 X 5/18 Which is approximately 3.40m/s

The speed of the cyclist = 3.40m/s

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Rahul Parmar
Sep 30, 2014

v= d/ t v = 12,250 m /3,600s =3.40 m/s southwest

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An hour contains 3600 seconds, not 3200!!!

A Former Brilliant Member - 6 years, 8 months ago

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SORRY ,MY FRIEND THAT'S MY FAULT!

RAHUL PARMAR - 6 years, 8 months ago

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That's all right!! :)

A Former Brilliant Member - 6 years, 8 months ago

HAVE TRIED VALUES 3.401 AND 3.4 IT SHOWED ME WRONG ANSWER. WHAT IS THIS!! CORRECT IT AND DEFINE A LEVEL 1 FOR 5 POINTS ONLY....

Ravi Prakash - 6 years, 8 months ago

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Ravi, my records indicate that you answered correctly. You gave an answer of 3.402, and it was marked correct. Can you send me a screenshot where it said that you were wrong?

Calvin Lin Staff - 6 years, 8 months ago

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yes ! that's true it's 3.402 but i h'v posted till 2 decimal place, is there any problem

RAHUL PARMAR - 6 years, 8 months ago

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@Rahul Parmar – Rahul, there is no issue with your question. I have updated the answer to 3.40, after I edited the question.

My concern is with Ravi's comment that his answer was marked incorrect, even though my records indicate that he was correct (because we give a slight leeway for decimal answers). If this was true, then there is likely to be a bug and I would like to determine the error.

Calvin Lin Staff - 6 years, 8 months ago

u got me wrong by considering 3200 instead of 3600

Sakshi Suri - 6 years, 8 months ago

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