Two carts collide and bounce apart. Cart 1 had a momentum of negative 6 kilograms times m over s before the collision. Cart 2 had a momentum of 10 kilograms times m over s before the collision. What is the total momentum of the carts after the collision?

The total momentum is conserved during the collision, assuming no external force acts on the carts. Add their initial momenta, keeping the signs: −6 + 10 = 4 kilograms·m/s. So the carts’ total momentum after the collision is 4 kilograms·m/s, which is choice C.

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