97. Since we will be taking the vector cross product in the course of our calculations, below, we note first that when the two vectors in a cross product GGAB×are in the xyplane, we have GAA Axy=##i +j and GBB B=i +j, and Eq. 3-30 leads to GGAB AB AByx×=−di#k. Now, we choose coordinates centered on point O, with +xrightwards and +yupwards. In unit-vector notation, the initial position of the particle, then, is Grs0=#i and its later position (halfway to the ground) is Grs h=−ij12. Using either the free-fall equations of
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