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As shown in the figure , auniform disc of mass m is rolling without slipping with an angular velocity w. The portion AB is rough and BC is smooth. When it crosses the point B disc will be in

 

$\begin{array}{1 1} a) \text{translational motion only} \\ \text{ b) pure rolling motion} \\ \text{c) rotational motion only} \\ \text{d) none of these} \end{array}$

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Since the body is rolling on the rough surface, friction does not act.
On the smooth surface, Since no external torque, and forces are present , it continuous to roll.
answered Dec 5, 2013 by meena.p
 

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