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Two cars 1 \& 2 starting from rest are moving with
\( \mathrm{P} \) speeds \( v_{1} \) and \( v_{2} \mathrm{~m} / \mathrm{s}\left(v_{1}v_{2}\right) \). Car 2 is ahead of car

W ' 1 ' by \( s \) meter when the driver of the car ' 1 ' sees car
' 2 '. What minimum retardation should be given to car '1' to avoid collision.
(1) \( \frac{v_{1}-v_{2}}{s} \)
(2) \( \frac{v_{1}+v_{2}}{s} \)
(3) \( \frac{\left(v_{1}+v_{2}\right)^{2}}{2 s} \)
(4) \( \frac{\left(v_{1}-v_{2}\right)^{2}}{2 s} \)
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