A box of Cheerios and a box of Wheaties are accelerated across a horizontal surface by a horizontal force F applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is 2N, and the magnitude of the frictional force on the Wheaties box is 4N. If the magnitude of F is 12N, what is the magnitude of the force on the Wheaties box from the Cheerios box.
The Attempt at a Solution
a=6/(C+W) ----- I am using C and W to represent the mass of the different boxes.
However I don't know where to use substitution on this.