Question

1. Using the values of acceleration in the spreadsheet, calculate Usain’s greatest and least net forces.A. When in the race does Usain exert the greatest net force in moving forward? When does he exert the least net force? How to these times relate to racing strategy?

Answer 1

`\begin{gathered} m=89kg \\ x=100m \\ t=9.58\text{ s} \\ a_(max)=4.86\text{ m/s}^2 \\ \\ The\text{ greatest net force is when he gets the maximum acceleration} \\ F_(net)=ma \\ F_(net)=(89kg)(4.86\text{ m/s}^2) \\ F_(net)=432.54\text{ N} \\ \\ He\text{ exerts the least net force at the beginning of the race and when he stops} \\ a=0\text{ m/s}^2 \\ F_(net)=(89kg)(0\text{ m/s}^2) \\ F_(net)=0\text{N} \end{gathered}`