Question : An express train is moving with a velocity 𝑣1. Its driver finds another train is moving on the same track in the same direction with velocity 𝑣2. To escape collision, driver applies a retardation 𝑎 on the train. The minimum time of escaping collision will be
(A) t=\dfrac{v_{1}-v_{2}}{a}
(B) t=\dfrac{v_{1}^{2}v_{2}^{2}}{2}
(C) none
(D) both
Answer : option (A)
Solution :
