In the 2008 Beijing Olympic Games, Jamaican bolt (as shown in the picture) is a recognized flying man in the world. He broke two world records and won two gold medals in the men's 100m final and men's 200m final by 9.69s and 19.30s respectively A. The displacement in the 200m final is twice that in the 100m final. B. the average speed in the 100m final is about 10.32m/s. C. The average speed in the 200m final is about 10.36m/s. D. the maximum speed in the 100m final is about 20.64m/s

In the 2008 Beijing Olympic Games, Jamaican bolt (as shown in the picture) is a recognized flying man in the world. He broke two world records and won two gold medals in the men's 100m final and men's 200m final by 9.69s and 19.30s respectively A. The displacement in the 200m final is twice that in the 100m final. B. the average speed in the 100m final is about 10.32m/s. C. The average speed in the 200m final is about 10.36m/s. D. the maximum speed in the 100m final is about 20.64m/s

A. The 200m race is a curve, the distance is 200m (the displacement is not 200m), the 100m race is a straight, the displacement is 100m, so a is wrong; B, the displacement of 100m race is 100m, so the average speed is. V = 100m9.69s = 10.32m/s, so B is correct; C, because the 200m race is a curve