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Flatcar is moving at speed v m/s with respect to ground (when two cars on it are moving with constant speed).
ma = 1800 kg
mb = 1700 kg
m_flat= 20*10^3 kg = 20000 kg
va = 2.35 + v m/s
vb = 1.175 + v ...
The answers are given in step-by-step equational processes to determine the system of particles based on flatcars.