A spherical ball of mass \( M \) moving with initial velocity \( u \) collides elastically with ...

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A spherical ball of mass \( M \) moving with initial velocity \( u \) collides elastically with another ball of mass \( M \), which is fixed at one end of \( L \) shaped rigid massless frame as shown in Fig. (a).
\( \mathrm{P} \)
W The \( L \) shaped frame contains another
(b) mass \( M \) connected at the other end. The angular speed of \( L \) frame immediately after collision is
(1) \( \frac{4 u}{7 l} \)
(2) \( \frac{u}{3 l} \)
(3) \( \frac{4 u}{2 l} \)
(4) \( \frac{u}{7 l} \)
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