Machine Design
The elasticity is the property of a material which enables it to

Resists fracture due to high impact loads
Draw into wires by the application of a tensile force
Regains its original shape after deformation when the external forces are removed
Retain deformation produced under load permanently

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Machine Design
In replacing the V-belts, a complete set of new belts is used instead of replacing a single damaged belt because

The new belt will carry more than its share and result in short life
New and old belts will cause vibrations
Belts are available in sets
Only one belt cannot be fitted with other used belts

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