Question

I have attached the question I'm needing help with. 2 previous posts have the same question but different answers. Which one is correct? Thank you|!

6. Olympic spring Usain Bolt set the world record in the 100 meter dash with a time of 9.58 seconds. The physics behind his performance are impressive. Physicists have modeled his position as a function of time to be as follows: A B Aelt +B X(t)= In + In k A+B k A+B A+ Bes where A=110 m/s, B=12.2 m/s, k=0.9 1/s. Using this information, find his acceleration when t= O seconds. If his mass was 86 kg at the time of the race, what was his force at t = 0 seconds. What was the force from the ground on Bolt at t = 0 seconds?

Answer 1

Second solution has wrong calculation but concept is right

Final answer

First solution is correct and has right concept too

a=17.8 m/s2

F=1530.8 N