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A child is sitting at one end of a long ...

A child is sitting at one end of a long trolley moving with a uniform speed `v` on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed `u` (w.r.t. trolley), the speed of the centre of mass of the system will.

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No change in speed of system as no external force is working.
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Knowledge Check

  • A child is standing at one end of a long trolley moving with a speed v on a smooth horizontal track. If the child starts running towards the other end of the trolley with a speed u, the centre of mass of the system (trolley + child) will move with a speed :

    A
    Zero
    B
    `(v+u)`
    C
    `(v-u)`
    D
    v

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