Which of the following groups of forces could | vedclass

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(A) For three forces to be in equilibrium,the sum of any two forces must be greater than or equal to the third force,and the difference of any two for

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$3 \, N, 4 \, N, 5 \, N$

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(A) For three forces to be in equilibrium,the sum of any two forces must be greater than or equal to the third force,and the difference of any two forces must be less than or equal to the third force. This is equivalent to saying the three forces must satisfy the triangle inequality: $a + b \ge c$,where $c$ is the largest force.Checking the options:$A$: $3 + 4 = 7 \ge 5$ (Satisfied)$B$: $4 + 5 = 9 $C$: $30 + 40 = 70 $D$: $1 + 3 = 4 Therefore,only the group $3 \, N, 4 \, N, 5 \, N$ can form a closed triangle and be in equilibrium.

Which of the following groups of forces could be in equilibrium?

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