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An express train is moving with a velocity \( v_{1} \). Its
P driver finds another train is moving on the same track

W in the same direction with velocity \( v_{2} \). To escape collision, driver applies a retardation \( a \) on the train, the minimum time of escaping collision will be
(1) \( t=\frac{v_{1}-v_{2}}{a} \)
(2) \( t_{1}=\frac{v_{1}^{2}-v_{2}^{2}}{2} \)
(3) None
(4) Both
\( \& \) Laser Pointer \( \& \) Pen
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