Question

Since mass is a form of energy,can we conclude that a compressed spring has more mass than the same spring when it is not compressed

Answer 1

Answer:

Yes. When you compress a spring you do work on it, adding energy to it. ... As you rightly point out, the E=mc2 relation for an object at rest can then lead us to conclude that the rest mass of a compressed spring exceeds the rest mass of an uncompressed spring.