Is the kinetic energy of the two-cart system in Figure 6.12 in the zero-momentum reference frame less than, equal to, or greater than the system's kinetic energy in the Earth reference frame?

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Figure 6.12 Collision between two carts as seen (a) from the Earth reference frame and (b) from the zero-momentum reference frame. The inertias of the carts are m = 0.36 kg and m = 0.12 kg and the x axis points to the right in the diagrams. (a) Earth reference frame (b) Zero-momentum reference frame (Ez = +0.20 m/s) = 0 ZE ZE E cart 2 cart 1 E cart 2 cart 1 E cart 2 cart 1 E cart 2 cart 1 VEX (m/s) zx (m/s) 1.2 1.2 0.8 collision cart 2 0.4- 0 cart 1 -0.4 -0.8 20 20 49 40 60 80 80 0.8 cart 2 0.4 t (ms) 0 100 120 20 40 81 cart 1 -0.4 -0.8 collision t (ms) 60 80 100 120