An object falls from a high place and falls to the ground after 4 seconds. It is known that the falling distance in the first second is 4.8 meters, and the falling distance in each second is 4.8 meters more than the previous 1 second. How many meters above the ground did the object fall before it fell?
一个物体从高处落下，经过4秒落地，已知第1秒下落的距离是4.8米，以后每秒下落的距离都比前1秒多4.8米，这个物体在下落前离地面多少米？
<gadget id="calculator">4.8 + 4.8 + 4.8 + 4.8 + 4.8 + 4.8 + 4.8 + 4.8 + 4.8 + 4.8</gadget>
<output>48</output>

<result>48</result>