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7. A train travels with a speed of 60 km h from station A to station B and then comes back with a speed 80

7. A train travels with a speed of 60 km h from station A to station B and then comes back with a speed 80 km h- from station B to station A. Find: (i) the average speed, and (ii) the average velocity Ans. (i) 68.57 km h-. (ii) zero of train

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