Acceleration can be both up and down, even if they have a seperate word for the negative form of it. I was told in Physics not to use the word 'deceleration' as it's not scientificallycorrect.
Don't say you don't have enough time. You have exactly the same number of hours per day that were given to Helen Keller, Pasteur, Michaelangelo, Mother Teresa, Leonardo da Vinci, Thomas Jefferson, and Albert Einstein. — H. Jackson Brown
