Oliver (m=90.0 kg) uses a 4.60 m long rope to pull Jordan (m=53.6 kg) across the floor (μk=0.200) at a constant speed of 1.14 m/s. Jordan signals to Oliver to stop by "plucking" the rope, sending a wave pulse forward along the rope. The pulse reaches Oliver 149.0 ms later. What is the mass of the rope? I am doing m= ukmg*L\v*squared but it is not working, am I suppose to find a new velocity or something. Any help appreciated.