Read the passage carefully and answer Q.
A train starts from rest and accelerates uniformly at 100 min_2 for 10 min. It then maintains a constant velocity for 20 minutes. The brakes are then applied and the train is uniformly retarded. It comes to rest in 5 minutes.
The maximum velocity retarded is
(A) 1000 m min-1
(B) 2000 m min-1
(C) 3000 m min-1
(D) 500 m