Скачать или смотреть [1.187] - Problems in general Physics by I E Irodov: Solution by Saket Sir

1.187. A disc A of mass m sliding over a smooth horizontal surface
with velocity v experiences a perfectly elastic collision with a smooth
stationary wall at a point 0 (Fig. 1.48). The
angle between the motion direction of the disc A
and the normal of the wall is equal to a. Find:
(a) the points relative to which the angular
momentum M of the disc remains constant in
this process;
(b) the magnitude of the increment of the
vector of the disc's angular momentum relative
to the point 0' which is located in the plane
of the disc's motion at the distance 1 from the
point 0.

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