Orbital Trajectories of Cannonballs

http://media.pearsoncmg.com/aw/aw_0media_astro/if/if.html?orbit_trajectory_cannonball

An interactive applet where you shoot a cannonball at different speeds. As you increase the speed, you can make the ball orbit the Earth, or escape Earth’s gravity entirely.

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Orbital Trajectories of Cannonballs