Cart 1, with m1= 4.9 kg, is moving on a frictionless linear air track at an initial speed of 1.3 m/s. It undergoes an elastic collision with an initially stationary cart 2, with m2, an unknown mass. After the collision, cart 1 continues in its original direction at 0.4 m/s. 1) The horizontal component of the momentum is conserved for cart 1. cart 2. the system of cart 1 and cart 2. Momentum is not conserved for any of these systems