Why the elasticity is equal to the end of the spring tension?

Many people go do not understand, why the elasticity is equal to the end of the spring pushing? Spring manufacturer after detail * should be established first to master: ideal light spring arbitrary point of relativity on overall, stillness and arbitrary point entities T ( Zhang/pressure) ( Relaxation in size as 0) , so in T> 0, spring, in addition to both sides of the point on the other components on it a set of balance; While both sides only by single bit/pressure, must both sides plus a set of balance force make the dynamic balance, or to consolidate spring/stretch. In addition because spring quality close to 0, so can ignore the harm of spring whole instantaneous velocity ( Out by law) , in view of the ideal light line can also be similar to solve.
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