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by selecting the time t1 and its position vector r1 when the particle enters the box, as well as the time t2 and its position vector r2 when the particle leaves the box. t1, t2 and the y components, y1 of r1 and y2 of r2, are measured here. The lower left corner of the box represents (x,y)=(0,0), hence x1=0 and x2 = size box = 14.1 cm |