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Two forces ar...

Question

Two forces are acting as shown in figure. The magnitude of resultant of the two forces is :

A

5 \sqrt{3} N

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B

10 N

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C

5 \sqrt{5} N

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D

None of these

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Solution

The correct option is D $10 N$
$R = \sqrt{10^{2} + 10^{2} + 2 \times 10 \times 10 \times c o s 120^{\circ}}$ $= 10 N$

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