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

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

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

All listed here
Algebraic sum of moments of forces, constituting a couple, about any point, is same
A couple can be never the balanced by a single force
Algebraic sum of forces, constituting a couple is zero

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