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A wedge of mass M fitted with a spring of stiffness ‘ k ’ is kept on a smooth horizontal surface. A rod of mass m is kept on the wedge as shown in the figure. System is in equilibrium. Assuming that all surfaces are smooth, the potential energy stored in the spring is :

1. 2 2 mg tan 2K 
2. 2 2 m gtan 2K 
3. 2 2 2 m g tan 2K 
4. 2 2 2 m g tan K 

Correct answer: 2 2 2 m g tan 2K 

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