Bolt, a famous sprinter, has set new world records in 100m and 200m sprint events in Beijing Olympic Games. His results are 9.69s and l9.30s respectively. Suppose that his reaction time from starting to starting is 0.15s in 100m race, and he does uniform acceleration after starting, and does uniform acceleration after reaching the maximum speed. In 200m race, the reaction time and acceleration and acceleration time in acceleration stage after starting However, due to the influence of curve and physical strength, the average speed in the future is only 96% of the maximum speed in the 100m race? Why? (2) Acceleration time and maximum speed: (3) acceleration of uniform acceleration after starting

Bolt, a famous sprinter, has set new world records in 100m and 200m sprint events in Beijing Olympic Games. His results are 9.69s and l9.30s respectively. Suppose that his reaction time from starting to starting is 0.15s in 100m race, and he does uniform acceleration after starting, and does uniform acceleration after reaching the maximum speed. In 200m race, the reaction time and acceleration and acceleration time in acceleration stage after starting However, due to the influence of curve and physical strength, the average speed in the future is only 96% of the maximum speed in the 100m race? Why? (2) Acceleration time and maximum speed: (3) acceleration of uniform acceleration after starting

(1) In the 200m race, the displacement is not 200m, so the average speed can not be calculated by 20019.30m/s, so the average speed is not 10.37m/s. (2) the acceleration time, reaction time and the maximum speed V are 0 + v2t + V (T1 − △ t − T) = X1 in the 100m race and 0 + v2t + 96% v (t

Bolt, a famous sprinter, has set new world records in 100m and 200m sprint events in Beijing Olympic Games. His results are 9.69s and l9.30s respectively. Suppose that his reaction time from starting to starting is 0.15s in 100m race, and he does uniform acceleration after starting, and does uniform acceleration after reaching the maximum speed. In 200m race, the reaction time and acceleration and acceleration time in acceleration stage after starting However, due to the influence of curve and physical strength, the average speed in the future is only 96% of the maximum speed in the 100m race? Why? (2) Acceleration time and maximum speed: (3) acceleration of uniform acceleration after starting

(1) In the 200m race, the displacement is not 200m, so the average speed can not be calculated by 20019.30m/s, so the average speed is not 10.37m/s. (2) the acceleration time, reaction time and the maximum speed V are 0 + v2t + V (T1 − Δ t − T) = X1 in the 100m race and 0 + v2t + 96% v (T2 − Δ t − T) = x2 in the 200m race. The simultaneous solution is t = 1.29, v = 11.24m/s. (2) after starting, make a uniform increase The solution is: a = VT = 11.241.29m/s2 = 8.71m/s2 A: (1) no, because 200m is not displacement; (2) the acceleration time is 1.29s and the maximum speed is 11.24m/s; (3) the acceleration of even acceleration after starting is 8.71m/s2