A child is standing at one end of a long trol | vedclass

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(D) The system consists of the child and the trolley. Since the floor is smooth,there is no external horizontal force acting on the system. According

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(D) The system consists of the child and the trolley. Since the floor is smooth,there is no external horizontal force acting on the system. According to the law of conservation of momentum,the velocity of the centre of mass of an isolated system remains constant. Initially,the entire system (child + trolley) is moving with a speed $v$. Therefore,the velocity of the centre of mass of the system remains $v$ throughout the motion,regardless of the child's movement relative to the trolley.

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

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