Question : The motor of an electric train can give it an acceleration of 1 ms−2 and brakes can give a negative acceleration of 3 ms−2. The shortest time in which the train can make a trip between the two stations 1215 m apart is
(A) 113.6 s
(B) 56.9 s
(C) 60 s
(D 55 s
Answer : option (B)
Solution :

