Applied Mechanics and Graphic Statics
A system of coplanar forces is in equilibrium when

Both force polygon" and funicular polygon close
Force polygon closes
Funicular polygon closes
All the forces are concurrent

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Applied Mechanics and Graphic Statics
The maximum displacement of a particle executing S.H.M. corresponds to

Zero potential energy and maximum kinetic energy
Zero kinetic energy and maximum potential energy
Maximum kinetic energy and maximum potential energy
Minimum kinetic energy and minimum potential energy

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