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The earth moves around the sun in a nearly circular orbit of radius 1.50*10^11m. During the three summer months (an elapsed time of 7.89*10^6s), the earth moves one-fourth of the distance around the sun. (a)what is the average speed of the earth? (b) what is the magnitude of the average velocity of the earth during this period?

I can't get the right answer for this problem again.Please give me some hints to do it.Thanks a lot.

  • physics -

    What is the circumference of a circle? Divide that by 4, and you have the distance Mother Earth moved. You are given the time,

    avg velocity= distance/time.

    I get about2.99E4 m/s

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