The following combination is not feasible to be in equilibrium : 10,10,10
The correct option is A.
What is equilibrium?
A state in which opposing forces or influences are balanced is called equilibrium.
The addition of two smaller forces must be greater than the third force in case of three forces to be in equilibrium.
For A: 10 + 10 >10 or 20 > 10
For B: 10 +5 <17 or 15 <17
For C: 5 +10 > 12 or 15 >12
For D: 5 +12 >13 or 17 >13
So, the gap between the magnitude of balancing forces is very high in (10,10,10).
Thus, the correct option is A.
Learn more about equilibrium.
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