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Seven identical birds are flying south together at constant velocity. A hunter shoots one of them, which immediately dies and falls to the ground. The other six continue flying south at the original velocity. After the one bird has hit the ground, the centre of mass of all seven birds

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continues south at the original speed, but is now located some distance behind the flying birds

stops with the dead bird

continues south, but at $\frac{6}{7}$ the original velocity

continues south, but at $\frac{1}{7}$ the original velocity

answer is B.

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Detailed Solution

Once the bird comes to rest its $V = 0$
velocity of all others is still $V$ (south wards)

$V_{c m} = \frac{\sum_{`} m_{i} v_{i}}{\sum_{`} m_{i}}$

Let their mass be $M$ each

$\Rightarrow V_{C} = \frac{V M + V M + V M + V M + V M + V M + 0 \times M}{7 M} = \frac{6 V}{7}$

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