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First, let's convert the velocities to m/s:
Initial velocity of the lorry = 72 km/h = 20 m/s
Final common velocity = v m/s
Using the principle of conservation of momentum:
Initial momentum = final momentum
(3000kg * 20m/s) + (600kg * 0) = (3600kg * v)
60000 + 0 = 3600v
v = 60000 / 3600
v = 16.67 m/s
Therefore, the common velocity after the collision is 16.67 m/s.