If you run down a vertical cliff...
d=1/2at^2
t=sqrt[2d/a]
t=sqrt[2(50)/(9.81)]
t=3.2
So about 3.2 seconds
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It depends how fast u can run
1.8
It depends on how fast you are. Anywhere from 1 to 3 minutes for most people. Where 1 would be a fast sprint and 3 would almost be a walk.
4.5 mph i think isnt it speed = distance over time so 300 divided by 72 = 4.5 approx
Well I'm 12 and I ran it in 5:47. After me, a person a year older than me got 6:14. Later I got told he was the best in HIS year. So an average time for a 12 year old boys must be around 7 mins