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Homework Help: Concept question

  1. Oct 11, 2005 #1
    A ball is thrown vertically upward. Consider the following quantities: 1)speed, 2)velocity and 3) acceleration. Which of these will be zero when the ball has reached the maximum height?

    Won't all three be zero?
  2. jcsd
  3. Oct 11, 2005 #2
    Acceleration is never 0 on Earth...
    Think about it this way, it's BECAUSE of the acceleration that the velocity & speed have become 0... 'cause the ball was moving up with some positive velocity along the y axis, and the acceleration acts downwards and thus reduces it.
  4. Oct 11, 2005 #3
    I see...so the velocity and speed are 0 at the max height, but the acceleration is always 9.8m/s^2?
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