"She was supposed to be astern while she was sleeping."
The stern is the back end. Astern is 'toward' the stern.
Motion in a straight line.
The definition of particle motion is how much you're able to sleep on a daily basis.
motion
Comparing one motion to another.
Because a projectile by definition, is in motion.
The definition of variable motion is direction and/or changes in speed. This can refer to anything from walking to driving a car.
without rough motion; without rough motion
a quick motion
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set into motion