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Homework Help: Do images move faster than objects?

  1. Sep 10, 2013 #1
    1. The problem statement, all variables and given/known data

    A cat sees its image in a plane mirror. The cat is 1 m from the mirror. A) Where is the image? B) The cat lunges at the mirror at 2 m/s. How fast does the cat approach its image?

    3. The attempt at a solution

    I understand that for a, the image would also be 1 m away from the mirror. I thought this would be the case for 2B too, that the image would move as fast as the object was found its image would actually move 4 m/s. I don't understand why this would be the case...Any input on this would be appreciated.
  2. jcsd
  3. Sep 10, 2013 #2
    The image indeed moves with 2 m/s but with respect to the mirror. So what is the relative velocity between cat and its image?
  4. Sep 11, 2013 #3
    The cat is moving toward the mirror cat, and the mirror cat is moving toward the cat. Think of it as two cars about to collide.
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