The ease with which an object's motion can be stopped in track and field events like javelin throw and shot put can be comparatively assessed based on their momentum values. Between the javelin and the shot, the mass of the shot is nine times greater than the mass of the javelin, whereas the shot's velocity is one-third of the javelin's velocity. On substituting the mass and velocity values in the equation, the shot's momentum appears to be greater than that of the javelin. Therefore, it would be more difficult to stop the heavy shot despite its low velocity as compared to the javelin. When an object's mass remains constant, then a change in momentum is expressed as a product of mass and change in velocity. As per Newton's second law of motion, the net force equals the product of mass and acceleration. By expressing acceleration in terms of velocity and from the definition of change in momentum of an object of constant mass, the net force becomes equal to the rate of change of momentum caused by the force. This expression is nothing but Newton's second law of motion in terms of momentum.