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Average Speed

57.A particle...

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57.A particle covers first half of the distance with speed of 6 m/s.The second half of the distance it covers in two equal time intervals with respective speed of 3 m/s and 9 m/s.The average speed of the particle of the particle for the entire journey is 1)6 m/s 2)9m/s 3)12m/s 4)10m/s

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