The state that the acceleration of an object increases by the force applied to it

Newton's second law

Explanation:

Newton's second law states the relationship between the acceleration of an object, its mass and the force applied on it:

where

F is the force applied to the object

m is the mass of the object

a is its acceleration

We can re-arrange the equation to solve for the acceleration, and we find:

And from this formula, we see that as the force applied to the object increases, the acceleration increases as well.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form