Two carts collide and bounce apart. Cart 1 had a momentum of −6 kg⋅m/s before the collision. Cart 2 had a momentum of 10 kg⋅m/s before the collision. What is the total momentum of the carts after the collision?

The total momentum of the carts is conserved during the collision, even though they bounce apart. Add their initial momenta: −6 kg⋅m/s + 10 kg⋅m/s = 4 kg⋅m/s. Therefore, the total momentum after the collision is 4 kilograms times m over s, choice D.

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