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forces of 3N and 4N and 12N act at a point in mutually perpendicular directions. Tha magnitude of the resultant force in newton is

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Fr = 3N[0o] + 4N[90o] + 12N[180o] =
3 + 4i -12 = -9 + 4i, Q2.

Fr = Sqrt ((-9)^2 + 4^2)
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