In which of the following exmples of mot...

In which of the following exmples of motion, can the body be considered approxinmately a point object :
(a) a railway carriage moving without jerks between two two stations.
(b) a mondey sistting on top of a man cycling smoothly on a circulat track. (c ) a spinning cricket ball that turns sharply on hitting the round . (d) a tumbling beake theat has slopped off the edge of a table ?

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a,b

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…………………… deals with the motion of bodies considering the cause of motion.

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