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<p><b><a href="page.php?w=asymptotically">asymptotically</a> approaches a maximum value called the <a href="page.php?w=terminal_velocity">terminal velocity</a> v<sub>t</sub>:</b></p>

<p>For an object falling and released at relative-velocity v&nbsp;=&nbsp;v<sub>i</sub> at time t&nbsp;=&nbsp;0, with v<sub>i</sub> < v<sub>t, is also defined in terms of the hyperbolic tangent function:</></p>

<p>For v<sub>i</sub> > v<sub>t</sub>, the velocity function is defined in terms of the <a href="page.php?w=hyperbolic_cotangent">hyperbolic cotangent</a> function:</p><p>
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