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).
P
W The \( L \) shaped frame contains another
(b) mass \( M \) connected at the other end.
The speed of the striking mass after collision is
(1) \( u / 2 \) backwards
(2) 0
(3) \( u / 3 \) in same direction
(4) \( u / 7 \) backwards
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