Two masses M1 and M2 are connected by light string, which passes over the top of a smooth plane inclined at 30 degree to the horizontal,so that one mass rests on the plane and the other hangs vertically as shown in figure.

Initially at time t=0 masses (M1=15 kilogram and M2=10 kilogram) are held at rest and then they released. If after one second, the string snaps, find the further time taken for the 15 kilogram mass to return to its original position on the plane.

30 M M