1. The problem statement, all variables and given/known data A cart (m1 = 130 kg) is moving to the right along a track at v1i = 24 m/s when it hits a stationary cart (m2 = 350 kg) and rebounds with a speed of v1f = 4 m/s in the opposite direction. a) With what speed does the 350 kg cart move after the collision? A: 10.4 m/s An observer moves in the same direction as the incoming cart with a speed of 12 m/s. Using the convention that the positive direction is to the right, what are the following velocities with respect to this observer: b) v1i, ob... A: 12 c) v2i, ob... A: -12 d) v1f, ob... A: 16 e) v2f, ob... A: -1.6 This is the annoying part... f) What is the total momentum of the system before the collision as seen by this moving observer? g) What is the total momentum of the system after the collision as seen by this same observer? 2. Relevant equations m1v1 = m2v2 Any thoughts on how to solve this? I'm a little lost.