Answer:
The value is [tex]F = 1.10 *10^{-8} \ N [/tex]
Explanation:
Generally the gravitational force between the two particles is mathematically represented as
[tex]F = \frac{G * m_1 * m_2 }{r^2}[/tex]
Here G is the gravitational constant with value  [tex]6.67300 * 10^{-11} m^3. kg^{-1} s^{-2}[/tex]
  substituting  [tex]  8,000 g =  8kg  [/tex] for  [tex] m_1 [/tex] ,  12 kg for  [tex] m_2 [/tex] and  [tex]  2.5 ft =  0.762 \  m [/tex]  for  r
     [tex]F =  \frac{6.67300 * 10^{-11}  *  8  *  12 }{0.762 ^2}[/tex]
     [tex]F = 1.10 *10^{-8} \  N [/tex]
