Tension in each string in the 3 - box system is T1 = m2 * f/m, T2 = m3 *f/m, a = f/m1+m2+m3.
In 3 - box system:
There are two tensions and two strings, let T1 and T2 be the tensions.
Let mass of boxes be m1,m2,m3
total mass m = m1+m2+m3
Acceleration a = force / m
a = f/m1+m2+m3
T1 = m2 * f/m
T2 = m3 * f/m.
Therefore Tension in each string in the 3 - box system is T1 = m2 * f/m, T2 = m3 *f/m, a = f/m1+m2+m3.
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