Find the speed of the train if the passenger counted it during the observation time t = 1.0 min. 25 telegraph poles.

Find the speed of the train if the passenger counted it during the observation time t = 1.0 min. 25 telegraph poles. Distance between adjacent poles s = 50 meters.

t = 1 min = 60 s.

n = 25.

S1 = 50 m.

V -?

To find the speed of movement of the train V, it is necessary to divide its movement path S by the movement time t: V = S / t.

Since the passenger counted n pillars, the distance between which is S1, the train traveled (n – 1) intervals with the distance S1. Therefore, its path will be determined by the formula: S = (n – 1) * S1.

The train speed V will be determined by the formula: V = (n – 1) * S1 / t.

V = (25 – 1) * 50 m / 60 s = 20 m / s.

Answer: the speed of the train is V = 20 m / s.