JEE Advanced Model Paper 18 with solutions for online practice

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Paragraph- II For Question No.s 13 to 14 :

A small disc and a thin uniform rod of length L , whose mass is  times greater thanthe mass of the disc, lie on a smooth horizontal plane. The disc is set in motion , inhorizontal direction and perpendicular to the rod with velocity V , after which itelastically collides with the end of the rod.
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Question : 14
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