$\"\"$

\

The function is $\"\"$ .

\

Consider moving point as $\"\"$ .

\

The distance between two points is $\"\"$ .

\

Consider $\"\"$ is the distance between the origin $\"\"$ and the point $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Substitute $\"\"$ in the above expression.

\

$\"\"$

\

Distance between the origin $\"\"$ and point $\"\"$ is $\"\"$ .

\

$\"\"$

\

$\"\"$ .

\

Apply derivative on each side with respect to $\"\"$ .

\

$\"\"$

\

$\"\"$

\

$\"\"$ .

\

Substitute $\"\"$ in above expression.

\

$\"\"$

\

The rate of change of distance is $\"\"$ .

\

$\"\"$

\

The rate of change of distance is $\"\"$ .

\

.