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^{2}and a=gm/r

^{2}, when r is replaced with (r

_{0}-x), with r

_{0}being the initial radius from the mass from which the gravitational field originates, and x being the distance traveled since t=0, due to the acceleration of the field. Combining these equations gives

x=1/2(gm/(r

_{0}-x)

^{2})t

^{2}

I don't know how to solve that equation for x, and I'm hoping this is the place to look for help. Thanks.