Andy mass 80 kg uses a 30 m long rope to pull bob mass 60, Ask an Expert

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Andy (mass 80 Kg) uses a 3.0 m long rope to pull Bob ( mass 60 kg) across the floor (µk=0.20) at a constant speed of 1.0 m/s. Bob signals Andy to stop by "plucking" the rope, sending a wave pulse forward along the rope. The pulse reaches Andy 150 ms later. What is the mass of the rope?

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