The velocity of a parachutist during free fall is f(t)=82 (1-e-0.12) meters per second. Answer the following questions using the graph. (Recall that acceleration is the derivative of velocity.) (b) What is the approximate acceleration when t=0? 10 m/sec (c) Approximately when is the parachutist's velocity 51 m/sec? 8 seconds (d) Approximately when is the acceleration 5 m/sec? Ay 80- 70- 60 50- 40- 30- 20 10- 0- 0 10