The vertical intercept of a weight-mass graph represents the weight of an object when its mass is zero, which is zero Newtons. This conclusion is based on the direct proportionality between weight and mass, as defined by the equation W = mg, where W is weight, m is mass, and g is the acceleration due to gravity. Since mass cannot exist without weight on Earth, the y-intercept confirms that at zero mass, the weight is also zero.
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