C 440 ] 
Confequently, by the Leibnitian Do&rine, to which, 
in this particular Cafe, where the Bodies are equal, 
we alfo agree, the two Springs will give equal moving 
Forces to the two Bodies. 
But the moving Force received by the hindmoft 
Fody from the hinder Spring, was undoubtedly the 
moving Force 1 : For by that Force given it in the 
Direction backwards, the moving Force 1, which it 
had before from the Motion of the Plane in the Dire- 
ction forwards, is exadly balanced and deftroyed, the 
Body remaining, as was obferved before, in abfolute 
Reft. 
Therefore the moving Force received by the fore- 
moft Body from the foremoft Spring, was alfo the 
moving Force 1. And this, added to the other 
moving Force 1, which it had before from the 
Motion of thePlane, makes the moving Force 2, and 
not the moving Force 4, as the Leibnitian Philofo- 
phers pretend. 
Confequently, that Body, which had before the 
Velocity 1, and the moving Force 1, and now has 
the Velocity 2, has alfo the moving Force 2 : That 
is, the moving Forces are proportional to the Velo- 
cities. 
1 
