Question two known forces f1 25 n at 79o below the x axis, Ask an Expert

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Question: Two known forces F1 = 2.5 N at 79^o below the +x axis and F2 = 2.5 N at 39^o above the - x axis are acting on an object.

Part A: What is the magnitude of the third force F3 so that the acceleration of the object is zero?

I want you to explain the physics in this question.

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