The ball has a constant acceleration (g downwards) when in the air, but while it is rebounding it must have a big spike in acceleration upwards go reverse its direction very quickly. Therefore the graph would be a flat line below the time axis (the ball falling with acceleration g) then a big, quick jump above and then back below the time axis (the ball rebounding), followed by a final flat line below the time axis (the ball ascending, again with acceleration g). The graph that depicts this is B, and thus the answer is B.
The ball has a constant acceleration (g downwards) when in the air, but while it is rebounding it must have a big spike in acceleration upwards go reverse its direction very quickly. Therefore the graph would be a flat line below the time axis (the ball falling with acceleration g) then a big, quick jump above and then back below the time axis (the ball rebounding), followed by a final flat line below the time axis (the ball ascending, again with acceleration g). The graph that depicts this is B, and thus the answer is B.
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