Question: You use a hammer to give a sharp horizontal blow to a (10-mathrm{kg}) lead brick suspended from the ceiling by a wire that is (5.0

You use a hammer to give a sharp horizontal blow to a $10-\mathrm{kg}$ lead brick suspended from the ceiling by a wire that is $5.0 \mathrm{~m}$ long. It takes $70 \mathrm{~ms}$ for the pulse generated by the sudden displacement of the brick to reach the ceiling. What is the mass of the wire?

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