    Sentence © How can you prove that the path of  a point which possesies two constant velocities  c_along _a_fixed direction and _the other  Sap tthe Tada See ca Ro  fixed point is a conic section?  Sentence = A bunch of people are lined up at  various positions along a line. IF you pick a point  for all of them to walk to, how do you prove  that the median point of all the people's  Prations & the one that requre the leat total  walking?