on</a> update_averages_;</div><div class="line"><a name="l00377"></a><span class="lineno">  377</span>&#160;</div><div class="line"><a name="l00378"></a><span class="lineno">  378</span>&#160;            <span class="keyword">explicit</span> <a class="code" href="class_s_p_h_1_1solid__dynamics_1_1_average_velocity_and_acceleration.html">AverageVelocityAndAcceleration</a>(<a class="code" href="class_s_p_h_1_1_solid_body.html">SolidBody</a> &amp;solid_body);</div><div class="line"><a name="l00379"></a><span c