16 0/2 points Compressed Spring 1 kg 2 kg Figure 1 2 Velocity (m/s) 1 2 kg -- 1 kg 0 2 Time (s) Figure 2 3 Two carts of masses 1 kg and 2 kg travel together, as shown in Figure. At time t = 2 s, a compressed spring inside the 2 kg cart expands, and the carts separate. Figure 2 shows a graph of the carts' velocities as a function of time. What is the magnitude of the change in linear momentum, if any, of the two-cart system between t = 0 s and t = 4 s? 0.5 kg m/s 0 kg. m/s 2.0 kg. m/s 1.0 kg. m/s