Before railroad were invented, goods often traveled along canals, with mules pulling barges from the bank. if a mule is exerting a 12,000n force for 10km, and the rope connecting the mule to the barge is at a 20 degree angle from the direction of travel, how much work did the mole do on the barge?
a. 12mj
b. 11mj
c. 4.1mj
d. 6mj

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