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Old Mar 5th 2009, 12:56 AM   #1
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Falling under Gravity

A body falls from rest from the top of a towerk, and during the last sec, it falls 9/25 of the whole distance. Find the height of the tower in feet
[ taking g = 32 ft/s*2 ]
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Old Mar 5th 2009, 08:24 AM   #2
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let the whole distance be h covered in time t then the distance covered in time (t-1) sec will be h- 9h/25 = 16h/25.
Now apply the formula s = ut + (1/2)gt^2 at time t and (t-1)
In time t
h = (1/2)gt^2 ..........( u being zero )

In time (t-1)
16h/25 = (1/2) g(t-1)^2

Devide the first eq by second one, find t and then find h using any of the two eqs.
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