- #1
relion65
- 5
- 0
Me and my friend have been arguing about the coordinate system used for the earth... specifically gravity. he's trying to tell me the value of gravity is -9.8ms/2, when I've read from several books and other online resources that's it 9.8ms/2... a positive number. Hes keeps going on and on and on about how it has to be negative to go down, when, i know for a fact from being a java programmer, that coordinate systems work in the way that positive numbers make u move downward... now the Earth and 2d coordinate system used for bouncing balls might be a different thing, but same principal. basically, all i want to know, is gravity -9.8ms/2(a negative number), or 9.8ms/2(a positive number)?