On a speed time graph a line with a negative slope indicates that the object is

a and b sometimes have a positive value

graph question answered .. you think better when you are relaxed and happy

myth. it was once thought that animals, including cats and dogs, could only see in black and white. however, scientists have proven this to be a myth. in all animals, including humans, the perception of colour is determined by the presence of cells in the eye called cone photoreceptors.