The total length of the bar represents both the total distance and the total time taken. The bar is divided into parts. Each part represents the speed as a distance per unit of time. The number of ...

The distance graph shows the height of a plane as it completes a journey. When the plane is at a height of 38,000 feet (ft), it travels at a constant speed of ... Therefore the time taken is ...

Today, scientists do not see problems of time or motion as "absolute" with a single correct answer. Because time is relative to the speed one is ... our universe. (The word "relativity" derives ...