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Dear Student
As the vector passes through origin and the point (3,4,5) the unit vecor along this dirction is
3 i + 4j +5k/√50 (Unit vector can be be obtaoned by dividing the vector by its mod)
Since the force has magnitude 100N
the force vector becomes magnitude * unit vector =100* (3 i + 4j +5k/√50)
Thanks
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