Speed (m/s) = Distance (m) / Time (s)
Speed = 400 / 50
Average Speed = 8 metres per second
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8m/s
9.09 m/s
200 metres/28 seconds = 7.1 metres/second, to the justified number of significant digits.
200 metres in 40 seconds 20 metres in 4 seconds 300 metres in 60 seconds or 1 minute 18000 metres in 60 minutes or 1 hour 18 kilometres in 1 hour
speed = distance/time so he runs 75/30 = 2.5 m/s