In a closed system, a cart with a mass of 1.5 kg is rolling to the right at 1.4 m/s , while another cart of mass 1.0 kg is rolling to the left at the same speed. What is the total momentum of the system of two carts

Apossible explanation for a set of facts that can be tested by further investigation is called

What was the first instrument to ever record an earthquake?

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.