A ball falls freely from a high place, and the height of each bounce is 2/5 of the height of the previous drop. If the ball falls from 75 meters, what is the height of the second bounce?
球从高处向下自由落下，每次弹起的高度是前次下落高度的2/5，如果球从75米处落下，第二次弹起的高度是多少米．
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">75 * (2/5) * (2/5)</gadget>
<output>12</output>

<result>12</result>