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In which of the following examples of motion, can the body be considered approximately a point object:

(d) a tumbling beaker that has slipped off the edge of a table.


The size of a beaker is comparable to the height of the table from which it slipped. Hence, the beaker cannot be considered as a point object.
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In which of the following examples of motion, can the body be considered approximately a point object:

c) a spinning cricket ball that turns sharply on hitting the ground.


The size of a spinning cricket ball is comparable to the distance through which it turns sharply on hitting the ground. Therefore, the cricket ball cannot be considered as a point object.
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In which of the following examples of motion, can the body be considered approximately a point object:
(b) a monkey sitting on top of a man cycling smoothly on a circular track


The size of a monkey is very small as compared to the size of a circular track. Therefore, the monkey can be considered as a point-sized object on the track.
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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


The size of a carriage is very small as compared to the distance between two stations. Therefore, the carriage can be treated as a point-sized object.
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A woman starts from her home at 9.00 am, walks with a speed of 5 km h–1 on a straight road up to her office 2.5 km away, stays at the office up to 5.00 pm, and returns home by an auto with a speed of 25 km h–1. Choose suitable scales and plot the x-t graph of her motion.

Speed space of space the space woman space equals space 5 space km divided by hr

Distance space between space her space office space and space home space equals space 2.5 space km space

Time space taken space equals space fraction numerator Distance space over denominator Speed end fraction equals fraction numerator 2.5 over denominator 5 end fraction space equals space 0.5 space straight h space equals space 30 space min space

Given space that space the space woman space covers space the space same space distance space in space the space evening. space

Speed space of space the space auto space equals space 25 space km divided by hr

Time space taken space equals Distance over Speed equals fraction numerator 2.5 over denominator 25 end fraction equals 1 over 10 equals 0.1 space straight h space equals space 6 space min

Distance minus time space graph space for space the space motion space of space woman space is space shown space below. space
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