
\magnification=\magstep2

$$
{\rm difference\ in\ acceleration\ } \Delta a \quad = \quad 
    \left |
    { { F_A } \over {1 {\rm \ kg}}} 
       - 
    { { F_B } \over {1 {\rm \ kg}}} 
    \right |
  \quad <  \quad
      10^{-9} * (9.8 \thinspace {\rm m}/{\rm s^2} )
$$



\bye
