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A child sits stationary at one end of a long trolley moving uniformly with a speed V on a smooth horizontal floor. If the child gets up and runs about on the trolley in any manner, what is the speed of the CM of the (trolley + child) system ?

Answer» <html><body><p></p>Solution :The running of the child will produce no effect on the velocity of centre of <a href="https://interviewquestions.tuteehub.com/tag/mass-1088425" style="font-weight:bold;" target="_blank" title="Click to know more about MASS">MASS</a> of the trolley. Because trolley and child has same system and <a href="https://interviewquestions.tuteehub.com/tag/force-22342" style="font-weight:bold;" target="_blank" title="Click to know more about FORCE">FORCE</a> and due to it child motion is <a href="https://interviewquestions.tuteehub.com/tag/purely-2962981" style="font-weight:bold;" target="_blank" title="Click to know more about PURELY">PURELY</a> internal. Since no <a href="https://interviewquestions.tuteehub.com/tag/external-981194" style="font-weight:bold;" target="_blank" title="Click to know more about EXTERNAL">EXTERNAL</a> force is involved in the child-trolley system, the child.s motion will produce no change in the velocity of the centre of mass of the trolley. As a result system of child and trolley have centre of mass with <a href="https://interviewquestions.tuteehub.com/tag/constant-930172" style="font-weight:bold;" target="_blank" title="Click to know more about CONSTANT">CONSTANT</a> speed.</body></html>


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