Book says that velocitys must have speed AND direction. going down or to the left on your coordinates, is negative. So if I am walking left along the x axis at 2m/s, my velocity is -2m/s But If I walk down along the y-axis will I also have a neg velocity? If so, then what is my velocity if I walk diagonally left and up, or right and down? Can someone explain this in simple terms? Thanks!