When you drop a ball, it is dropped DOWNWARDS so the number is represented by a negative number. If you toss the ball up it will be a positive number.
To answer your question:
When an object is dropped downwards there will be a negative number since the object is falling downwards.
The Krebs cycle occurs in the <span>matrix of mitochondria. It is one of the main processes of creating energy for the organism.</span>
