the weight of a man on the surface of moon is 300n.The weight of this man on the surface of the earth is ?
weight of body is equal to the product of it's mass and acceleration due to gravity but the acceleration due to gravity on the surface of moon is one sixth of that on the surface of the earth and thus you can say that a man weighs six time more on earth than that on the moon
therefore
weight of man on earth = 6 * weight on moon
= 6 * 300 = 1800 Newtons