In Michael Johnson's world$-$record $400m$ sprint, he ran the first $100m$ in $11\mathrm{.}20s$; then he reached the $200m$ mark after a total time of $21\mathrm{.}32$shad elapsed, reached the $300m$ mark after $31\mathrm{.}76s,$ and finished in $43\mathrm{.}18s.$

Part A

During what $100m$ segment was his speed the highest?

Between the start and the $100m$ mark.

Between the $100m$ mark and the $200m$ mark.

Between the $200m$ mark and the $300m$ mark.

Between the $300m$ mark and the finish.

Request Answer

Part B

During this segment, what was his speed in $\frac{m}{s}?$

Express your answer in meters per second.

$v_{\text{m}\text{a}\text{x}}=$

$\frac{m}{s}$