P. 3837. A wooden planck of mass m stays at rest on a horizontal surface (see the figure). A pointlike object of mass m moves along the horizontal surface with a speed of , and slides onto the circular part of the planck, than flies off (friction is negligible).
a) Find the velocity of the planck after the pointlike object left it.
b) Find the greatest height to which the pointlike object ascends.
Deadline expired on 12 December 2005.