A locomotive composition, with a constant speed of 75 km/h, moves in the westbound for fifty minutes, then in a direction that makes an angle of 25° to the west with the north direction, for 35 min and finally in the eastbound for another 40 min. Determine: (a) the module of the average composition speed, in km/h, during that journey; b) the angle of the average speed of the composition, in relation to the first direction of the trip.

College Physics
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ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
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Chapter1: Units, Trigonometry. And Vectors
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A locomotive composition, with a constant speed of 75 km/h, moves in the
westbound for fifty minutes, then in a direction that makes an angle of 25° to the west with the north direction, for 35 min and finally in the eastbound for another 40 min. Determine:
(a) the module of the average composition speed, in km/h, during that journey;
b) the angle of the average speed of the composition, in relation to the first direction of the trip.

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