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Fearofphysics: Physics problem of the week

Physics problem of the week: Superman and the building

A careless construction worker accidentally drops a wrench from the top of a 100-m tall building. It might hit the person below. Luckily, Superman is flying downward from above, and reaches the top of the building 2 seconds after the wrench was dropped. How fast should Superman be going in order to catch the wrench just before it hits the person on the head?

To submit your answer

  1. Create an electronic version of your answer, and post it to the web using Google Docs, Dropbox, Imgur, etc.
  2. Generate a "share link" to your answer (be sure the share link allows for public access).
  3. Paste the share link here:
  4. Type just your final answer here:
  5. Correct answers will be posted here when the problem expires (typically every Wednesday, when a new problem will be posted).

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