The velocity of a parachutist during free fall is f(t) = 75(1 – e -0.13t) meters per second. Answer the following questions using the graph. (Recall that acceleration is the derivative of velocity.) Ay 80- 70- y = f(t) 60니 50니 401 30- 20구 104 y = f'(t) 10 20 30 (a) What is the approximate velocity when t=20 seconds? m/sec

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