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

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

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Applied Mechanics and Graphic Statics
A point subjected to a number of forces will be in equilibrium, if

Two resolved parts in any two directions at right angles are equal
Algebraic sum of the forces is zero
Sum of resolved parts in any two directions at right angles, are both zero
Algebraic sum of the moments of the forces about the point is zero

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