Hello Everyone,
Every wondered why objects like spring give back energy when they uncoil?? Well one of the reasons fro this behavior is resilience of material with which spring is manufactured.
Resilience of material is the ability of it to absorb energy when deformed elastically due to applied stress and return the energy back when unloaded.
Modulus of Resilience is the measure of this property and as per the wikipedia, Modulus of Resilience can be calculated using the following formula:
, where σy is yield stress, E is Young's modulus, and 
is strain.with warm regards
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