According to scientists at the University of Toronto, “negative time”, which was previously considered an illusion, has turned out to be measurable through quantum mechanics. This discovery contests ...

A distance-time graph, sometimes referred to as a travel ... A return journey is not given a negative value as it is not completed in reverse or backwards. Speed is worked out by dividing distance ...

or \(= {ms}^{-2}\). A negative gradient shows the rate of 'slowing down' or deceleration. Velocity-time graphs show velocity on the vertical axis. Acceleration is still represented by the gradient.