$\"\"$

The force $\"\"$ acting on a body with mass $\"\"$ and velocity $\"\"$ is $\"\"$ .

The relative mass of a particle is $\"\"$ .

Acceleration of the body $\"\"$ .

Consider $\"\"$ .

Substitute $\"\"$ in above expression.

$\"\"$ .

Product rule of derivatives: $\"\"$ .

$\"\"$

Substitute $\"\"$ in above expression.

$\"\"$

Thus, $\"\"$ .

$\"\"$ .