Task id12146

A point body freely falls onto an inclined plane from a certain height to point A. A “trap” is set up for it using the horizontal half-plane BC. When falling from what height will the body fall into a “trap” (slip between points B and D)? All collisions experienced by a body are absolutely elastic. Consider two variants of the problem: 1) the distance between the half-plane BC and the inclined plane BD=1 m, AD=4 m. The angle of inclination of the plane to the horizon is a=45°; 2) the distance between the half-plane BC and the inclined plane BD is 2 m, AD = 12 m, the angle of inclination of the plane to the horizon is a = 45°.