Which of the following set of forces
cannot keep a body in equilibrium?

10 N, 10 N, 5 N

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5 N, 7 N, 9 N

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8 N, 4 N, 13 N

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9 N, 6 N, 5 N

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Solution

The correct option is C $8 N, 4 N, 13 N$
As force is a vector quantity, from triangle law, the greatest of all the forces can not be greater than the sum of other two forces.
As $13 N > 8 + 4$ $[∵ R_{max} = A + B]$

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