Keeping your sign conventions for direction is very important.all velocity directed down must be negative, and all velocity directed up must be positive. 2. A college student drops his textbook out a second story window in the Oswald Building, which is 12m above the ground. a) What is the velocity of the book just before it hits the ground? b) 5m/s, what would the velocity of the book be just before it hit the ground? If the student had instead thrown the book upward with an initial velocity of

Keeping your sign conventions for direction is very important.all velocity directed down must be negative, and all velocity directed up must be positive. 2. A college student drops his textbook out a second story window in the Oswald Building, which is 12m above the ground. a) What is the velocity of the book just before it hits the ground? b) 5m/s, what would the velocity of the book be just before it hit the ground? If the student had instead thrown the book upward with an initial velocity of