A child is standing at one end of a long trolley \( P \) moving wit...

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A child is standing at one end of a long trolley
\( P \) moving with a speed \( v \) on a smooth horizontal floor.

W. 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) \( (v+u)(\mathrm{c})(v-u) \)
(d) \( v \)
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