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15. Calvin pulls his 13.5 kg sled across the level snow with a rope angled 40 above horizontal. The coefficient of friction between the

15. Calvin pulls his 13.5 kg sled across the level snow with a rope angled 40 above horizontal. The coefficient of friction between the sled and the snow is 0.15 and the acceleration of the sled is 0.44 m/s. How hard does Calvin pull on the rope?

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