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

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

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

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

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