The new and final Book 2 was concerned largely with the motions of bodies through resisting mediums.
2.
Some astronomers theorized that the comet might pass through a resisting medium near the sun and that would shorten its period.
3.
It also extended the methodology by adding the solution of a problem on the motion of a body through a resisting medium.
4.
In the absence of a suitable resisting medium, the excess power gets dissipated to the surroundings in the form of heat and also by raising the temperature of the carrying medium-which can in turn push the medium to higher energy levels and make it glow.
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