We already know that the initial velocity is zero and because the drag force is zero when velocity is zero, the initial acceleration is g in the downward direction, or -9.8 m/s/s . We can then calcula...We already know that the initial velocity is zero and because the drag force is zero when velocity is zero, the initial acceleration is g in the downward direction, or -9.8 m/s/s . We can then calculate the velocity after a short time interval as: Now that we have a velocity we can calculate the air resistance at the start of the second interval using our previous stated values for human drag coefficient, cross-sectional area, and the standard value for air density:
