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Acceleration question

  1. Oct 9, 2015 #1
    1. The problem statement, all variables and given/known data
    Which one of these motions is at constant acceleration?
    A) A car moving at a constant speed and constant direction.
    B) A train making stops along its route.
    C) A moon orbiting a planet.

    2. Relevant equations


    3. The attempt at a solution
    I believe that A is an acceptable answer, since the car is at a constant acceleration of zero.
    My teacher says C is the only correct answer.

    Thank you for your input!
     
  2. jcsd
  3. Oct 9, 2015 #2

    SteamKing

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    Your teacher needs to go back to school.
     
  4. Oct 9, 2015 #3

    rude man

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    I agree. The teacher seems to be entertaining the notion that the orbit of the moon is a perfect circle, which it ain't.
     
  5. Oct 10, 2015 #4
    How the teacher can select C? Have you asked what is the reason?
     
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