Problem

Three cars approach an intersection: an 800 kg car moves in the positive x-direction at 10m/s, a 1200 kg car moves in the negative x-direction at 5m/s, and a 900 kg car moves in the positive y-direction at 12m/s. What is the total momentum of this system of three cars? Give your answer as a magnitude and an angle counterclockwise from the positive x-axis.

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