Question

two trains, one traveling at 72km/h and the other traveling at 120km/h, are heading towards eachother on the same track. When they are 875m apart, the train engineers see one another and apply the brakes at the same time. The brakes decelerate the trains at a rate of 1.1m/s^2. Will the trains collide?

Answer 1

20,100/3 will be velocities in m/s
now velocity after time of 200/11 will be zero acc to (v-u)/t=a of train 1 having v=20m/s. but velocity of other train is not zero for train 2 after time 200/11 second acc to (v-u )/t=a hence they will collide