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19 August, 02:54

A train travels in a straight line at 18.0 m/s for 2 km, then at

30.0 m/s for another 2 km.

Is the average speed greater than, less than, or equal to 25m/s

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Answers (2)
  1. 19 August, 02:57
    0
    First, the train travels at 18 m/s for (2000/18) seconds.

    Then it travels at 30 m/s for (2000/30) seconds.

    Average speed = (total-distance) / (total-time)

    Total distance = 4000 meters

    Total time = (2000/18 + 2000/30) s

    That's (10,000/90 + 6,000/90)

    That's (16,000/90) or (1600/9) sec

    Average speed = (4000•9/1600) m/s

    Average speed = 22.5 m/s

    That speed is LESS THAN 25 m/s.
  2. 19 August, 03:20
    0
    It is less than 25m/s as the correct average is 24m/s.

    Explanation:

    This is becuase you need to take the average of the two speeds (18m/s and 30m/s) 18 + 30 divided by 2 is 24m/s.
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