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16 May, 21:00

17. A distance-time graph indicates that an object moves 120 meters in 5 seconds and then remains at rest for 5 seconds. What is the average speed of the object?

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  1. 16 May, 22:21
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    12 m/s

    Explanation:

    Speed is distance moved per unit time and expressed as

    S=d/t

    S is speed, d is distance and t is time.

    When at rest for five minutes, distance moved is zero hence speed is 0/5=0 m/s

    When having moved 120 m for 5 s then speed is

    S=120/5=24 m/s

    Average speed is the average of these two speeda

    Average speed = (24+0) : 2=24/2=12 m/s

    Therefore, average speed is 12 m/s
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