an elastic string of unstreched lenght l and force constant k is streched by a small amount x. It is further stretched by another small lenght y. what is the work done in second streching? a)1/2(y^2 - x^2) b)1/2ky(2x+y) c)1/2ky^2 d)1/2k(x^2 + y^2)

Asked by rekkakr1095 | 26th Nov, 2010, 01:35: PM

Expert Answer:

when it is streched by amount x its potential energy is
and when further streched by amount y its potential energy is
work done = change in potential energy
               
hence option b) is correct

Answered by  | 27th Nov, 2010, 12:38: AM

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