Answer:It means that the speed of a free falling object (an object only under the influence of gravitational force) increase at the rate of 9.8m/sec per second.
So the object will be traveling at 9.8m/sec just after 1st second is passed.
It would be traveling at 9.8m/s +9.8m/s =19.6m/s just after 2nd second.
It would be traveling at 19.6m/s + 9.8/s=29.4 m/s just after 3rd second,and so on .
