Explanation

(c) The earth is not a solid sphere but is somewhat flattened at the poles and bulged at equator, its equatorial radius is 21 km larger than its polar radius, since,
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$\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ g = \frac{GM}{R^{2}}$
Hence, value of $g$ is least at equator and maximum at poles. Also, $W = mg,$ therefore a person will get more quantity of matter in kg-wt at equator.