An object falls from a high altitude. The distance it falls in the first second is 4.9 meters. After that, the distance it falls in each second is 9.8 meters more than the previous second. After 50 seconds, the object falls to the ground. How many meters is the object from the ground before falling? ?
一个物体从高空下落，第一秒钟下落的距离是4.9米，以后每秒钟落下的距离都比前一秒钟多9.8米，50秒钟后物体落地，这个物体在下落前距地面多少米？
<gadget id="calculator">50 ** 2</gadget>
<output>2_500</output>

<gadget id="calculator">4.9 * 2_500</gadget>
<output>12_250</output>

<result>12_250</result>