----0-0- Top View 2. The figure above represents two carts, with magnets attached, that make up a system. The mass of one cart and the magnet is 1kg and the mass of the other and the magnet is 5kg. The carts are initially at rest on a frictionless track. They are released from rest and exert a repulsive force on each other. The track is not quite horizontal, with the right side slightly lower than the left side. The speeds of the carts are measured over a 10s interval. The graph below shows the momentum of the two carts as a function of time for this interval as they move along the x-axis. 1.5 1.0 5 kg . I ke 05- Momentum (kg .m/s) - Time (s) 10 -0.5 a. Based on the graph, were the measurements started at the instant the carts were released? Justify your answer. (2 points) b. Based on the graph, which cart had a greater net force on it? Justify your answer. (2 points) c. Calculate the magnitude of the net external force on the system. (Hint: similar to part (b)) (4 points) d. Explain why the force on each cart is not equal. (2 points)