*/*_A system of coplanar forces is in equilibrium when?

1.	/_A system of coplanar forces is in equilibrium when?
A.	Force polygon closes
B.	Funicular polygon closes
C.	Both force polygon" and funicular polygon close
D.	All the forces are concurrent
Answer» D. All the forces are concurrent

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*/*_A system of coplanar forces is in equilibrium when?

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/_A system of coplanar forces is in equilibrium when?