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A thin but very large plank of mass 2 m ...

A thin but very large plank of mass 2 m is placed on a horziontal smooth surface. A solid cylinder of mass m and radius r is given only translational velocity `v_(0)` and gently placed on the plank as shown in the figure. The coefficient of kinetic friciton between the plank and the cylinder is `mu`.

the cylinder given impluse t=0, than at what time pure rolling starts

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The correct Answer is:
(A)Q,(B)S,(C)P,(D)R
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