(Originais Teachy 2023) - Question Hard of Physics

A body of mass m is initially at rest at point A on an inclined ramp, which forms an angle of 30 degrees with the horizontal. The vertical height between A and the base of the ramp is h. Disregard friction and consider g = 10 m/s^2. At point B, which is at the same level as the base of the ramp, there is a block of mass 2m at rest. At the moment the body passes through point B, the block is released and starts to move. Neglecting the size of the block, determine the moment when the body and the block have the same kinetic energy. Additionally, theoretically justify the relationship between the gravitational potential energy at point A and the kinetic energy of the body at point B, considering the conservation of the mechanical energy of the system.