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CBSE Class 11-science Answered

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 | 26 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 | 27 Nov, 2010, 12:38: AM
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