A Train Starts from Rest and Accelerates Uniformly,until It Has

Multiple Choice

A train starts from rest and accelerates uniformly,until it has traveled 2.1 km and acquired a velocity of 24 m/s.The train then moves at a constant velocity of 24 m/s for 400 s.The train then slows down uniformly at 0.065 m/s²,until it is brought to a halt.The distance traveled by the train while slowing down,in km,is closest to:

A) 4.4
B) 4.2
C) 4.0
D) 3.8
E) 3.6