Simple extension to problem by Nishant Rai

A uniform disc of mass m m and radius R R starts with a velocity v o v_{o} on a rough horizontal floor with a purely sliding motion at time t = 0 t=0 . At time t = t o t=t_{o} disc starts rolling without sliding. Which of the following is/are true?

(A) Work done by frictional force up to time t t 0 t \le t_0 is given by m μ g t 2 ( 3 μ g t 2 v 0 ) \frac{m \mu gt}{2} \left( 3 \mu gt - 2 v_0 \right) .

(B) Work done by frictional force up to time t t 0 t \le t_0 is given by m μ g t 2 ( 2 μ g t 3 v 0 ) \frac{m \mu gt}{2} \left( 2 \mu gt - 3 v_0 \right) .

(C) Work done by frictional force up to time t = 2 t 0 t =2t_0 is given by m μ g t ( 3 μ g t 2 v 0 ) {m \mu gt}\left( 3 \mu gt - 2 v_0 \right) .

(D) Work done by frictional force up to time t = 2 t 0 t =2 t_0 is given by m μ g t 2 ( 3 μ g t 2 v 0 ) \frac{m \mu gt}{2} \left( 3 \mu gt - 2 v_0 \right) .

BD D None B BC AC AD

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