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Direction of Friction

The figure sh...

Question

The figure shows mass $m$ moves with velocity $u$ . Find the velocity of ring at that moment. Ring is restricted to move on smooth rod.

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Solution

Consider the attached figure while going through the following steps.
$V cos 60^{\circ} = u$
$\frac{v}{2} = u$
$v = 2 u$ .

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