fortran code
3. In Newtonian physics the motion of a certain small body in the gravita- tional field of a much more massive one is modeled by the differential equation +u 3 dt2 given that u(0) 1 and u(0) 0. The meaning of t here is actually theta of polar coordinates and u is the reciprocal of the radial coordinate r. Use a numerical method to solve this in the interval 0 S tS 23.
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