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

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

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

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

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