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Physics - Kinematics Question with Solution | TestHub

PhysicsKinematicsRelativeMedium2 minQB

PhysicsMediumsingle choice

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

Options:

Answer:

Solution:

$(v_{cm})_{i} = \frac{m v \times 7}{7 m} = v$

$(v_{cm})_{f} = \frac{m \cdot 0 + ( m v ) \times 6}{7 m} = \frac{6}{7} v$

So the centre of mass moves with $\frac{6}{7}$ of its initial velocity. Option (B).

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:Relative

⏱ 2mℹ️ Source: QB

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