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Three springs A,B and C each of force co...

Three springs `A,B` and `C` each of force constant `K`, are connected at `O`. The other ends of `B` and `C` can slide on smooth sliders. A pan is hanging from other end of the spring `A`. When a block of mass `m` is placed into he pan, find the amount of workdone by the gravity on block system after it stops vibrating. The spring `C` does not sag :
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