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What are the steps on solving this problem? 19.4 Beginning from rest, a firefighter of mass M slides a vertical distance h=4m down a pole.

What are the steps on solving this problem?

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19.4 Beginning from rest, a firefighter of mass M slides a vertical distance h=4m down a pole. If the firefighter has velocity of magnitude v=5 m/s at the bottom, and the work done by friction is WF-1200 J what is the mass M of the firefighter? (A) 81 kg (B) 63 kg (C) 72 kg (D) 45 kg (E) 56 kg

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