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when it collides with wall then its linear momentam get reversed but there is no change in angular speed ...
speed of center of mass is reversed ...
just after collision ,
angular momentam = mvr - Iw = -mur + 2mur/5 = -3mur/5
after a long time , total angular momentam = mvr + Iw
=mvr + 2mvr/5 = 7mvr/5
since angular mometam is conserved so
7mvr/5 = 3mur/5
v = 3u/7
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