In which of the following examples of motion, can the body be considered approximately a point object:
A. a railway carriage moving without jerks between two stations.
B. a monkey sitting on top of a man cycling smoothly on a circular track.
C. a spinning cricket ball that turns sharply on hitting the ground.
D. a tumbling beaker that has slipped off the edge of a table.
A) The size of the carriage is very small as compared with distance between the stations. So, it can be considered as point object.
B) The size of the monkey is very small as compared with circular track and man so, it can be interpreted as point object.
C) Spinning ball size is very small as compare with ground. Thus, it can be taken as point object.
D) Tumbling beaker is not much smaller than the height of the table to consider it as point object. So, it is not considered as point object.