Figure 2 Two carts of masses 1 kg and 2 kg travel together, as shown in Figure 1. At time t :; 2 9,, 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 - - ll 5, and t 4s? (A) 1) kg - IIL-'s (B) 0.5 kg - 111.55 (C) 1.\" kg - Inf}; (D) 2.111135 - 111,58