Right now I'm trying to just calculate the force from the kick. I believe I need to calculate the initial velocity (from before the graph starts), and then calculate the instantaneous velocity at point (0,0) when the ball is kicked - then use these to calculate the change in momentum in order to determine the force... however, the answer I ended up with (<614,0,0>N) just doesn't seem right to me, so I'm trying to figure if/what I'm doing wrong. Thanks in advance!