What 2 ideas were introduced in Newton's principia?

Explanation:

Newton's first law states that a stationary body remains at rest, and a moving body remains in motion unless a resultant force acts on it, which is known as the law of inertia of bodies. Newton's second law states: If we act upon a body with a force that changes its state of motion, then this force is equal to the magnitude of the change in momentum with respect to time.

battle of saint-mihiel, (12–16 september 1918), allied victory and the first u.s.-led offensive in world war i. the allied attack against the saint-mihiel salient provided the americans with an opportunity to use their forces on the western front en masse.

explanation:

the best description of postwar writers might be progressive.

following the war, writers showed a tendency to work on artistic or social matters rather than political themes. while postwar literature may not have been the greatest period of english literature, the themes provided excellent critics a high number of novels. such examples include anthony burgess, anthony powell and frank kermode, all of which can be placed under the progressive view.