Uncle Wang carried out high-altitude detection by balloon. A can of drink in his hand fell from high altitude and landed after 5 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 many meters was Uncle Wang from the ground at that time?
王叔叔乘汽球进行高空探测，他手中一罐饮料从高空下落，经过5秒落地．已知第一秒下落的距离是4.9米，以后每一秒下落的距离都比前一秒多9.8米．王叔叔当时距地面多少米？
<gadget id="calculator">9.8 * 4</gadget>
<output>39.2</output>

<gadget id="calculator">4.9 + 39.2 + 4.9</gadget>
<output>49</output>

<gadget id="calculator">5 / 2</gadget>
<output>5/2 = around 2.5</output>

<gadget id="calculator">49 * (5/2)</gadget>
<output>245/2 = around 122.5</output>

<result>245/2 = around 122.5</result>