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Impulsive Forces in Collision

A block of A ...

Question

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

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Solution

$A - 3$
$B - 4$
$C - 1$
$D - 2$

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