K. 4. Two trains start from rest from two stations 2000m apart and travel, on two parallel railroad tracks, in
opposite directions. One train accelerates uniformly at 4 m/s2 and the other has a constant velocity of 20 m/s.
a. How far from the first station will they meet? (6 marks)
b. Sketch the d versus t graph of this event. (4 marks)

The duration of a photographic flash is related to an rc time constantly

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.