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Landau Vol.1 Mechanics(3rd ed.) Ch.II §7. Momentum Problem
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[QUOTE="Delta2, post: 6027970, member: 189563"] The situation is almost as your image, it is just that the angles denoted as ##\theta_i## by the book are the complementary angles of the angles you have draw in the image.(because the book says angles formed by the normal to the plane and the velocity, instead you have draw angles formed by the parallel to the plane and the velocities.) The direction of the force is vertical to the horizontal line (why?) and parallel the plane of paper. It is not vertical to the paper. Because we have no horizontal forces involved, conservation of momentum holds along the horizontal axis so what do you get if you apply conservation of momentum along the horizontal axis ?(remember to first redraw the angles ##\theta_i##). [/QUOTE]
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Landau Vol.1 Mechanics(3rd ed.) Ch.II §7. Momentum Problem
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