Uh oh! Wolfram|Alpha doesn't run without JavaScript.
Please enable JavaScript. If you don't know how, you can find instructions
here
.
Once you've done that, refresh this page to start using Wolfram|Alpha.
(r''(t) = -G M/R^3 r(t), r(0) = R, r'(0)=0)
Natural Language
Math Input
Extended Keyboard
Examples
Upload
Random
