A floor-mat of mass M made up of extensi...

A floor-mat of mass M made up of extensible material, is rolled along its length so as to form a cylinder of radius R and kept on a rough horizontal surface. If the mat is now unrolled, without sliding, to a radius `(R )/(2)`, the decrease in potential energy is

`(2)/(5)MgR`

`(5)/(7)MgR`

`(7)/(8)MgR`

MgR

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