A cart has a mass of 120 kilograms. It is moved at a speed of 3.5 meters per second until it collides with a stationary dumpster. Both the cart and the dumpster are free to roll in any direction. The cart and the dumpster stick together after the collision. What other information is needed to determine the final momentum of the dumpster? Choose the correct answer.
the mass of the dumpster
the initial velocity of the dumpster
the kinetic energy of the cart before the collision