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Ethan drags his backpack on the floor by a string after a long day. He pulls with a force of 78.75N at an angle 26.17

Ethan drags his backpack on the floor by a string after a long day. He pulls with a force of 78.75N at an angle 26.17∘ above the horizontal. How many newtons of force is pulling the backpack upward.

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