this made them wonder if perhaps the ball's speed increased because the pull of gravity increased the lower the ball went.
(the pull of gravity; increased the lower; ) (the ball; went; ) (this; made; them wonder if perhaps the ball's speed increased) Context(this made,List([0, 9))):(them; wonder; if perhaps the ball's speed increased because the pull of gravity increased the lower)
this made,List([0, 9))
the pull of gravity the ball this them
increased the lower went made wonder
them wonder if perhaps the ball's speed increased
if perhaps the ball's speed increased because the pull of gravity increased the lower