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Calculating average acceleration from graphs

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A cat chases a mouse until the cat gets tired. A graph of the cat's velocity over time is shown below.
What is the cat's average acceleration from 12 to 24 seconds?
Answer using two significant figures.
  • Your answer should be
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • an exact decimal, like 0.75