Question : Two trains travelling on the same track are approaching each other with equal speeds of 40𝑚/𝑠. The drivers of the trains begin to decelerate simultaneously when they are just 2.0𝑘𝑚 apart. Assuming the decelerations to be uniform and equal, the value of the deceleration to barely avoid collision should be
(A) 11.8m/s^{2}
(B) 11.0m/s^{2}
(C) 2.1m/s^{2}
(D) 0.8m/s^{2}
Answer : option (D)
Solution :
