1. The problem statement, all variables and given/known data Determine from the left graph the speed at t1. Answer: Draw the tangent (right graph) at t1 and determine the slope. v = 1.4/0.30 = 4.7 m/s 2. The attempt at a solution The slope is (Y2-Y1)/(X2-X1). t1 coordinates are (0.24-0.25, 0). In order to get the answer I should draw a tangent line exactly in the (0.54, 1.4) coordinates. How is it possible? As I uderstand the tangent line should be as close to the curve as possible, before crossing it. I printed out the left graph and I get like (0.58, 1.4). So the answer is 4-4.3 depending on the 0.24-.25. So my questions: Am I plotting the tangent line right? (the closest as possible to the curve) If not, how should I plot it? Where is my mistake, so I can get the 4.7 m/s answer? Thank you all in advance.