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In [2]: r1_i = [-1,0]; r2_i = [0,0]; v1_i = [1,0]; v2_i = [0,0]; p1_i = r1_i * v1_i
r1_i = [-1,0]; r2_i = [0,0]; v1_i = [1,0]; v2_i = [0,0]; p1_i = r1_i * v1_i
In [ ]: