A block \( A \) of mass \( M_{A}=1 \mathrm{~kg} \) is kept on a smooth horizontal surface and at...

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A block \( A \) of mass \( M_{A}=1 \mathrm{~kg} \) is kept on a smooth horizontal surface and attached by a light thread to another block \( B \) of mass \( M_{B}=2 \mathrm{~kg} \). Block \( B \) is resting on ground, and thread and pulley are massless and frictionless. A bullet of mass \( m=0.25 \mathrm{~kg} \) moving horizontally with velocity of \( u=200 \mathrm{~m} / \mathrm{s} \) penetrates through block \( A \) and comes out with a velocity of
\( \mathrm{P} \) \( 100 \mathrm{~m} / \mathrm{s} \).
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