A) \[t=\frac{{{v}_{1}}-{{v}_{2}}}{a}\]
B) \[{{t}_{1}}=\frac{v_{1}^{2}-v_{2}^{2}}{2}\]
C) None
D) Both
Correct Answer: A
Solution :
As the trains are moving in the same direction. So the initial relative speed \[({{v}_{1}}-{{v}_{2}})\] and by applying retardation final relative speed becomes zero. From \[v=u-at\] Þ \[0=({{v}_{1}}-{{v}_{2}})-at\] Þ \[t=\frac{{{v}_{1}}-{{v}_{2}}}{a}\]
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