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All the way to the ground.
320 meters
The answer depends on the variables plotted in the graph.
Because this is a free fall questions, the equation d=1/2gt² can be used. Gravity is a given, 9.8 m/s² and the time is your 15 seconds of free fall. d=1/2(9.8m/s²)(15s)²= 1,102.5m. To find feet multiply 3.28084 to answer because that is how many feet are in a meter.
d = 16t² t = 1 s → d = 16 × 1² = 16 × 1 = 16 ft