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A railway truck of mass 16000kg moving with a velocity of 5ms^-1 strikes another truck of mass 4000kg at rest. If they move together after impact, their common velocity is

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2ms^-1

4ms^-1

6ms^-1

8ms^-1

answer is B.

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Detailed Solution

$\vec{v} = \frac{m_{1} \vec{u_{1}} + m_{2} \vec{u_{2}}}{m_{1} + m_{2}}$

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