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Problem Solving Steps for using Equations of Motion Follow these steps in solving the problems: 1. Draw a sketch: Show the object of interest at the beginning and end of the interval. Assign a + direction with a black + arrow. Attach and label all the relevant parameters (color code ‘em!): Δx vo vf a Δt + Partial example: vo 2. If the acceleration is constant, identify the don’t know/don’t care variable and select the equation of motion that goes with it. (If the acceleration not constant, abort the mission!) 3. Solve the equation algebraically first. 4. Finally, plug in the numbers, round to the correct number of sig figs, and check the units.