Two identical carts glide without friction on a straight track

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

Two identical carts glide without friction on a straight track. Cart A moves to the right at

0.60\,\text{m/s}

, while cart B moves to the left at

0.60\,\text{m/s}

. Using the positive x-direction to the right, describe the net linear momentum of the two-cart system and briefly explain your reasoning.