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Answer on Mechanics | Relativity Question for adeshina

Question #56259
12 a bird flies parralell to a railway track at a speed of 60 km/h. what is the speed of the bird as observed by a passenger in a coach of a train moving on the track in the same direction as the bird at a speed of 160km/h?

220 km/h

240 km/h

100 km/h

120 km/h

13 a driver does a round trip to ibadan from lagos, returning to his take-off point in five hours. the distance of ibadan from lagos is 130 km. what is his average velocity?

52 km/h

26 km/h

0 km/h

104 km/h

14 a booat can travel at a speed of 12 km/h on still water of a river. when the river is flowing at a speed of 3 km/h the boat can also travel at a speed of 3 km/h relative to the water in the river. a boatman using this boat aims to cross the river from point a on the river bank to point b directly opposite to point a on the other bank of the river. how should he aim the boat to achieve this goal?

75.5 degrees upstream

14.5 degrees downstream

75.5 degrees downstream

14.5 degrees upstream
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