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The mass of a body determines the momentum p of the body at given velocity v ; it is a proportionality factor in the formula:p=mvThe factor m is referred to as inertial mass.But mass, as related to 'inertia' of a body, can be defined also by the formula:F=maHere, F is force, m is mass, and a is acceleration.By this formula, the greater its mass, the less a body accelerates under given force. Masses defined by formula (1) and (2) are equal because formula (2) is a consequence of formula (1) if mass does not depend on time and velocity. Thus, "mass is the quantitative or numerical measure of body’s inertia, that is of its resistance to being accelerated".http://en.wikipedia.org/wiki/Inertia#Mass_and_inertia

1) what tends to be the problem when one's RVJ is virtually the same as SVJ, and maybe even lower?2) what factors cause one's actual vertical to be so much lower than theoretical vj calculator? Shorter than average height? legs to torso ratio?