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Homework Help: Mechanics question

  1. Mar 5, 2006 #1
    Just wanted to clarify here:

    Sometime in mechanics exercises it is mentioned that the speed should be considered as constant, which in return means that the acceleration a = 0 ms-2.

    Now if it is mentioned that the acceleration should be considered as constant what does that mean? That the speed remains constant too?

    Please explain simply thanks :-)
     
  2. jcsd
  3. Mar 5, 2006 #2

    VietDao29

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    A falling apple undergoes a constant acceleration (i.e g), does that means the apple is falling at a constant speed?
    I think you should go over your textbook again, for a constant acceleration, we have:
    v = v0 + at, where:
    v0 is the initial velocity, a is the acceleration, and t is the time spent.
    :)
     
  4. Mar 5, 2006 #3

    arildno

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    Oops!
    If the SPEED is constant, it means that the acceleration is orthogonal to the velocity at all times; you can perfectly well have non-zero acceleration in this case.
     
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