Explanation

(a) The earth possesses rotational motion about an axis through its poles. The value of acceleration due to gravity at a place (at given latitude) is affected due to its rotational motion. If earth ceases to rotate, the weight of body at equator will increase. However, there will be no effect on the weight at poles. The effect of rotation of the earth on acceleration due to gravity is to decrease its value. Therefore, if the earth stops rotating, the value of $g$ will increase.