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Anonymous
20m/4s = 5m/s = 300m/min = 18000m/h = 18km/h
Wiki User
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1.5x10^_4secs=10/2=5g 3x10^_4 secs= 5/2=2.5g 4.5x10^-4secs=2.5/2=1.25g so your answer would be 4.5x10^_4secs.