Two trains of equal weight, moving with velocities of 30 milesan hour each and in opposite directions collide. Show that the lossof energy caused by the impact is the same as in the case of atrain moving at 60 miles an hour striking another at rest. In thelatter case, find the velocity with which the debris will be movedalong the track. Also show that before impact the total energy inthe one case is doubled that in the other
​
