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A train is moving at a constant speed \( V \) when its driver observes another train in front of him on the same track and moving in the same direction with constant speed \( v \). If the distance between the trains is \( x \), then what should be the minimum retardation of the train so as to avoid collision?
(1) \( \frac{(V+v)^{2}}{x} \)
(2) \( \frac{(V-v)^{2}}{x} \)
(3) \( \frac{(V+v)^{2}}{2 x} \)
(4) \( \frac{(V-v)^{2}}{2 x} \)
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