b) When the force F acts on the body with mass m2:
The acceleration produced in the bodies \(
a = \frac{F}
{{\left( {m_1 + m_2 } \right)}}
\)
Force exerted on m1 is \(
F^1 = m_1 a\,\,\, = F\frac{{m_1 }}
{{m_1 + m_2 }}
\)
Reaction force acting on m2 is \(
F^1 = F\left( {\frac{{m_1 }}
{{m_1 + m_2 }}} \right)
\) (but opposite in direction)