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I All the three forces must be concurrent II Th... - JAMB Physics 2008 Question

I. All the three forces must be concurrent.
II. The upward force is equal to the downward force.
III. The algebraic sum of the moment about any point must be zero.

which of the above conditions must hold for a body acted upon by a system of three coplanar forces equilibrium?
I and II only
I and III only
II and III only
I, II and III
correct option: b
Option ii is one of the condition of an equilibrium of parallel forces only i and iii are correct
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