An object falls from a high altitude, and after 5 seconds, it is known that the falling distance in the first second is 5.2 meters. The falling distance in each subsequent second is 9.8 meters more than the previous second. How many meters was the object before falling?
一个物体从高空下落，经过5秒落地，已知第一秒下落的距离是5.2米．以后每一秒下落的距离都比前一秒多9.8米，这个物体在下落前距地多少米？
<gadget id="calculator">5.2 + 9.8</gadget>
<output>15</output>

<gadget id="calculator">9.8 * 2</gadget>
<output>19.6</output>

<gadget id="calculator">5.2 + 19.6</gadget>
<output>24.8</output>

<gadget id="calculator">9.8 * 3</gadget>
<output>29.4</output>

<gadget id="calculator">5.2 + 29.4</gadget>
<output>34.6</output>

<gadget id="calculator">9.8 * 4</gadget>
<output>39.2</output>

<gadget id="calculator">5.2 + 39.2</gadget>
<output>44.4</output>

<gadget id="calculator">5.2 + 15 + 24.8 + 34.6 + 44.4</gadget>
<output>124</output>

<result>124</result>