Phase 1 - The train starts at rest at point A and accelerates uniformly, traveling 500 meters to point B. The train passes point B with a velocity of 15 meters /second.
Phase 2 - After passing point B, the train maintains a constant velocity, and reaches point C in 40 seconds.
Phase 3 - After passing point C, the train decelerates at a uniform rate of 0.10 meters/second ², and passes point D with a velocity of 10 meters/second.

1. The acceleration of the train I phase 1, in SI units, is closest to:

A) 0.10 B) 0.22 C)0.34 D)0.48 E) 0.60

v²-v_o²=2a(x-x_o)

a = 15²/(2*500) = 0.225

2. The distance traveled at constant velocity, in SI units, is closest to:

A) 600 B) 800 C) 1000 D) 1100 E)1200

x-x_o = v*t x-x_o = 15*40 = 600

3. The time of travel between point C and point D, in SI( units, is closest to:

A) 50 B) 55 C) 60 D) 65 E)70

v = v_o - a.t

t =- (v - v_o)/a = -(10-15)/0.1 = 50