Final answer:
At terminal velocity, the air resistance acting on a falling object is equal to its weight. To calculate the value of air resistance, we need to use the drag force equation and set it equal to the weight of the object.
Step-by-step explanation:
In order to determine the air resistance acting on a falling object at terminal velocity, we need to know the drag force equation. For a skydiver, the resistive force of the air can be approximated by f = -bu². At terminal velocity, the net force on the skydiver is zero, meaning the drag force equals the weight of the skydiver. So, if the skydiver has a weight of 100 N, we can set the drag force equal to 100 N and solve for the value of b.