W) = 196 N , g = 9.8 ms-2So, mass (m) = (w / g) = 20 kg.Mass is a measure of the amount of matter in an object.Mass is always constant.Weight is the force of gravity on an object.Weight depends on the gravitational force of attraction.Weight (w) = Mass (m) * Gravitational acceleration (g)The weight of a BODY is greater in the pole of the earth than in the equator, because of acceleration of gravity at the poles is 980.665 cm/sec2 while at the equator it is 3.39 cm/sec2 less DUE to the centrifugal force.