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Two forces of magnitudes 5 N and 4 N act on a particle. Which of the following could be a possible magnitude of their resultant?

1. 10 N
2. 4 N
3. 3 N
4. 5 N

Correct answer: 5 N

Solution

The magnitude of the resultant of two forces lies between \(|5-4|=1\,\text{N}\) and \(5+4=9\,\text{N}\). Among the options, 5 N is within this range, so it is possible.

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