The figure shows a 6000 kg cable car descending a high hill. A counterweight of mass 5800 kg on the other side of the hill aids the brakes in controlling the cable car's speed. The rolling friction of both the cable car and the counterweight are negligible. How much braking force does the cable car need to descend at constant speed? Counterweight 200 m 30° 20° 10,000 N 980 N O 7100 N 4200 N

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