1.

 A bullet of mass a and velocity b is fired into a large block of wood of mass c, the final velocity of the system is

A.  \[\frac{b}{c+b}\]            
B.  \[\frac{a+b}{c}a\]
C.  \[\frac{a}{a+c}a\]             
D.         \[\frac{a+c}{a}b\]
Answer» D.         \[\frac{a+c}{a}b\]


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