Question

1. Usian Bolt holds the 100 m world record with a time of 9.58 s. During the race, he has a reaction time of 0.15 s, and then he accelerates at a constant rate from rest to his top speed in 2.73 s. He then runs at this top speed for the rest of the race. a) What was his top speed during the race? Hint: You might find it helpful to start this problem by sketching the velocity vs time curve for this problem. Since you don't know his top speed, leave this as an unknown variable. How can you find displacement or distance traveled from the velocity us time curve? Remember that the sum of the distance traveled through each of the different segments of the race must add to 100 m. b) Sketch the acceleration vs time curve for his race. Make sure you clearly label the important times and accelerations. c) Sketch the velocity vs time curve for his race. Make sure you clearly label the important times and velocities. d) Sketch the position vs time curve for his race. Make sure you clearly label the important times and positions. Important times and quantities are usually where the behavior of the plotted function changes. For example, the velocity of the runner increases for some time before becoming constant. You should label the point where this switch occurs with the corresponding time and velocity.

Answer 1

the duplaement must be 100n Us (2.43)4 Sx (9s8-2,89) = I00 S= 12.4 m/ t2=2.340.15 tz=95P t2=2.88 acelleretion: S=at az4.81 m S2 See X-Jate 4302 X-19 7M 160 958