Everybody, let's roll!

A small disc of mass 1kg slides down a smooth hill of height 6 m without initial velocity and gets onto a plank of mass 5 kg lying on a smooth horizontal plane at the base of hill as shown in the figure. Due to friction between the disc and the plank , disc slows down and after some time moves as one piece with the plank . Find out the magnitude of total work (in joule) performed by the friction forces in this process.

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