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Comprehension Type
A circular disc of mass ' \( 2 \mathrm{~m} \) ' and radius ' \( 3 r \) ' is resting on a
\( \mathrm{P} \) flat frictionless surface. Another circular disc of mass ' \( m \) ' and radius ' \( 2 r \) ' moving with a velocity ' \( u \) ' hits the first disc
W. as shown in the figure. The collision is elastic.
What is the magnitude of normal component of final velocity of the smaller disc?
(1) \( \frac{u}{5} \)
(2) \( \frac{2 u}{5} \)
(3) \( \frac{3 u}{5} \)
(4) \( \frac{4 u}{5} \)
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