Recent content by love2learn1

So does this mean that up was not chosen as the positive direction? I'm really confused on the sign conventions in physics. Why do you need the [U]?

But if it says - and [up] doesn't that mean that up is the negative direction

The acceleration due to gravity is -9.8m.s^2 [U], so what does the up mean, and what does the negative mean? I thought that the negative sign always means down and you don't need to put the direction in brackets.