elena (60.0 kg) and madison (65.0 kg) are ice-skating at the rockefeller ice rink in new yok city. their friend tanner sees elena move to the right with a speed of 1.20 m/s towards madison. madison is moving to the left at a speed of 2.50 m/s towards elena. what is elena's momentum? (assume the positive direction is to the right and the negative direction is to the left.)
