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Two forces of 3 N and 4 N act at right angles to each other on a body, as shown in the figure. The magnitude of their resultant is:

1. 1 N
2. 5 N
3. 7 N
4. 12 N

Correct answer: 5 N

Solution

When two forces act at 90°, their resultant is found using the Pythagorean theorem. So the magnitude is \(\sqrt{3^2+4^2}=5\) N.

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