An object falls from a height and lands after 6 seconds. It is known that the falling distance in the first second is 4.9 meters, and the falling distance in each subsequent second is 9.8 meters more than the previous second. How far was the object from the ground before it fell?
一个物体从高空下落，经过6秒落地．已知第一秒下落的距离是4.9米，以后每秒下落的距离都比前一秒多9.8米．这个物体在下落前距离地面多少米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">6 - 1</gadget>
<output>5</output>

<gadget id="calculator">5 * 9.8</gadget>
<output>49</output>

<gadget id="calculator">4.9 + 49</gadget>
<output>53.9</output>

<gadget id="calculator">4.9 + 53.9</gadget>
<output>58.8</output>

<gadget id="calculator">(1/2) * 58.8 * 6</gadget>
<output>176.4</output>

<result>176.4</result>