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April 18, 2014

April 18, 2014

Posted by **Rachel** on Thursday, April 11, 2013 at 11:15pm.

h =

- Physics -
**tchrwill**, Sunday, April 14, 2013 at 10:35amThe equations of accelerated motion, derived elsewhere, also apply to falling (or rising) bodies with the exception that the term "a" for acceleration is replaced by the term "g” for the acceleration due to gravity). This results in

....Vf = Vo + gt (the term “g” for acceleration due to gravity is assumed constant)

....d = Vo(t) + g(t^2)

..................2

....Vf^2 = Vo^2 + 2gd

where Vo = the initial velocity, Vf = the final velocity, g = the acceleration due to gravity, t = the time elapsed and d = the distance covered during the time period t.

g derives from g = GM/r^2 where

G = the universal gravitational constant,1.069304x10^-9ft.^3/lb.sec.^2,

M = the mass of the earth, 1.31672x10^25 lb., and r = the radius of the earth in feet, 5280(3963.4) = 20,926,752 feet, resulting in a mean g = g = 32.519ft./sec.6@.

As written, these expressions apply to falling bodies.

The equations that apply to rising bodies are

....Vf = Vo - gt (the term “g” for acceleration due to gravity is assumed constant on, or near, the surface of the Earth)

....h = Vo(t)-g(t^2)/2

....Vf^2 = Vo^2-2gh

All of the above ignores surface friction.

The height reached then becomes

h = Vo(t)-32.519(t^2)/2 where

t = (Vo - Vf)32.519 or

h = (Vo^2 - Vf^2)65.04

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