1. The problem statement, all variables and given/known data Table gives the rectilinear motion of a 4kg mass over a 5 s time interval. When the time was 3.8 seconds, the velocity of the mass was approximately what 2. Relevant equations 3. The attempt at a solution I first just tried to find the average of the velocities at 3.5 and 4.0 seconds, so (23+30)/2 = 26.5 m/s. But that was wrong as the answer should be 27.1 m/s. Then, I also saw that it wasn't linear, so I tried modeling the data to an exponential function of form A= Pe^(rt). And tried plugging in two points to find the constants and then plugged in 3.8 for t, but that didn't really work and gave me different values depending on which two initial points I used. How should this problem be done?