An athlete follows this trick to win competitions when she runs the 1.5 km race in a straightline. Starting with zero initial velocity, the athlete accelerates at 2416 miles/h2 for

20 s, then runs 1.2 km at a constant velocity, then for the remaining distance has a constant acceleration of 4832 miles/h2. A. Calculate the distance traveled in the first 20 s. B. What is the velocity of the athlete at t=20 s? C. Calculate the time taken to run the 1.2 km section. D. Calculate the total time taken to run the race.