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Velocity of COM

In situation ...

Question

In situation (i), just after both A and B jump from the platform, velocity of centre of mass of the system (A, B and the platform) is :

A

2 m/s

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B

6 m/s

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C

5 m/s

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D

none of these

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Solution

The correct option is D none of these
Since in situation (i) both of them jump simultaneously, there is no external force acting on the system, so velocity of COM will be zero.

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