10 kg motal = Pafter = 10 kg at rest P= 60 kg. pbefore = 2 m/s P = Slim Jim is running 2 m/s towards a box that is at rest. Jim then jumps onto the box and the two slide togethe A. On the diagram, calculate the net momentum before. B. What is the total mass of Jim and the box afterwards? C. Since momentum is always conserved, how much net momentum must there be afterwards? D. Calculate the final velocity of Jim and the box.