The initial velocity of a body is 4.60 m/s. What is its velocity after 5.50 s if it (a) accelerates uniformly at 3.00 m/s2; and (b) accelerates uniformly at -3.00 m/s2?

a train starts from rest and accelerates uniformly, until it has traveled 5.9km and acquired a velocity of 35m/s. The train then moves at a constant velocity of 35m/s for 400s. The train then decelerates uniformly at 0.065m/s^2, until it is brought to a halt. The acceleration during the first 5.9km of travel is closet to:

A train starts from rest and accelerates uniformly, until it has traveled 5.4 km and acquired a velocity of 31 m/s. The train then moves at a constant velocity of 31 m/s for 400 s. The train then decelerates uniformly at 0.065 m/s2, until it is brought to a halt. The distance traveled by the train during deceleration, in km, is closest to:

A train starts from rest and accelerates uniformly, until it has traveled 5.4 km and acquired a velocity of 31 m/s The train then moves at a constant velocity of 31 for 400 s. The train then decelerates uniformly at 0.065 m/s^2 until it is brought to a halt. The distance traveled by the train during deceleration, in km, is closest to