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Problem 4.1: Which is the correct free-body diagram?

Please wait for the animation to completely load.

A red block is pushed and moves as shown in the animation. In addition, a green block sits on the red block and moves as well. Restart.

  1. Which free-body diagram is correct? Give reasons why the other three diagrams are incorrect.
  2. How would your answer to (a) change if the blocks did not move?
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