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

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

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Applied Mechanics and Graphic Statics
A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight

Speed of the ball remains constant
Kinetic energy of the ball remains constant
Horizontal component of velocity remains constant
Vertical component of velocity remains constant

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Applied Mechanics and Graphic Statics
The phenomenon of collision of two elastic bodies takes place because bodies

Immediately after collision come momentarily to rest
Tend to compress each other till they are compressed maximum possible
All listed here
Attempt to regain its original shape due to their elasticities

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