We will have the following:
Assuming that the maxium distance and time of the fall is the one shown in the graph [Since there is no further data and more data cannot be extrapolated without more parameters}, that the ground at the bottom of the place it was dropped was absolutly flat and that the positive values represent the distance traveled while the object fell; we will have that:
The maximum displacement of the object is 240 meters and it would correspond with the inital heigth at which the object was dropped. [From the information provided]