Describe a situation when you might travel at a high velocity but a low acceleration

Relaxing in a comfortable seat, reading a book and listening to
some mp3 stored on your pod or your pad, your eyes are getting
heavy, you adjust yourself slightly in the seat, getting slightly more
comfortable, your eyes get so heavy that you can't hold them open,
and you doze off.

Your seat is #24-B in a passenger jet in straight and level flight,
cruising in calm air 35,000 feet above the ground, taking you to
visit your grandmother on the coast, at 500 miles per hour.