In today's edition of Play Smart, we look at a useful chart from instructor Erik J. Barzeski that shows the perfect speed for ...

The steeper the line, the greater the increase in speed. The area under the graph = the distance travelled. This is a speed-time graph for a car moving between two sets of traffic lights.

The tool is represented by a series of three trendlines drawn directly on a chart. The first speed line connects a recent high and low point in the asset's price. The second and third lines are ...