A wedge of mass M fitted with a spring of stiffness ' K ' is kept on a smooth horizontal surface....

Описание: 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) m g^2tan ^2θ/2  K
(2) m^2 g tan ^2θ/2 K
(3) m^2 g^2tan ^2θ/2 K
(4) m^2 g^2tan ^2θ/K

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