A uniform disc of mass and radius starts with a velocity on a rough horizontal floor with a purely sliding motion at time . At time disc starts rolling without sliding. Which of the following is/are true?
(A) Work done by frictional force up to time is given by .
(B) Work done by frictional force up to time is given by .
(C) Work done by frictional force up to time is given by .
(D) Work done by frictional force up to time is given by .
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