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Maximum energy stored in a spring-block system [closed]

1 vote

A block of mass $m$ is attached with an ideal spring of spring constant $k$ is kept on a smooth horizontal surface. Now the free end the spring is pulled with a constant velocity $u$ horizontally. The maximum energy stored in the spring and block system during subsequent motion is?

I think,
Spring will keep on extending till it gain velocity $u$ to stop free end's expansion, then spring is elongated it will apply force on mass $m$ till it again gain its natural length, by now maximum work has been done, so if I calculate $v_m$ then $E=\frac{1}{2}mv^2$, so how to calculate $v_m$?

closed as a duplicate of: Total Energy of The Block and Spring
asked Oct 6 in Physics Problems by n3 (318 points)
closed Oct 7 by n3
This question has been asked before : see http://physics.qandaexchange.com/?qa=562/total-energy-of-the-block-and-spring&show=562#q562 .  I think my answer to that question should answer your difficulty here.  Unless you have other difficulties with the question, I shall close this one as a duplicate.