A wire of  $9.8\times {10}^{-3}$ kg mass per metre passes over a frictionless massless pulley fixed on the top of an inclined frictionless plane, which makes an angle of ${30}^0$ with the horizontal. Masses $M_1$  and $M_2$ are tied at the two ends of the wire. The mass $M_1$  rests on the plane and the mass $M_2$  hangs freely vertically downwards. The whole system is in equilibrium. Now a transverse wave propagates along the wire with a velocity of  $100m{s}^{-1}$ the value of masses  $M_1+M_2$ in kg