|
The correct answer is of course that electric trains do not produce any smoke...
...but if it did, the problem is still far from straightforward. While one's initial reaction is to do vector arithmetics on the two velocities (73 to the SE and 31 to the N), that would not yield an accurate answer.
Such reasoning would work well for determining the velocity of a boat swimming in a current, but in the case of smoke (if such were to be produced by an electric train), it would not maintain the train's original velocity, since it would lack momentum (smoke, we will assume has practically no mass).
As such, the emmited smoke will immediately start moving with the wind, going north at 31 km/h, in a line extending further and further southwest. |
