In order to have the second hand have the staccato jerky motion, I would animate it over one second using keyframes, then use the "After Last Keyframe" command in the Keyframe Editor to make a Progressive repeating pattern. You can then bake that pattern into keyframes for the number of cycles you want in order for the second hand to stop where you want.
Freelance Producer/Editor/Motion Graphics Artist
Apple-certified Master Trainer
Author, Motion 4 from Peachpit Press http://www.applemotion.net