$\"\"$

The formula is $\"\"$ .

$\"\"$ (Substitute: $\"\"$ mt)

$\"\"$ (Divide each side by $\"\"$ )

$\"\"$ (Cancel common terms)

$\"\"$ (Divide: $\"\"$ ) $\"\"$

$\"\"$ (Taking square root to each side)

$\"\"$ (Use a calculator to find square root)

$\"\"$ (Cancel square and root)

$\"\"$ .

$\"\"$

The maximum running speed for a person with a leg length of 0.64mt is $\"\"$ .