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The joke that the glass fell to the ground and broke.

Dynamic potential energy transformation problem, glass will be deformed when it encounters collision, and will rebound under the force of restoring prototype.

Glass has stable molecular structure, good elastic deformation and small energy loss after touching the ground.

Glass has great mass and kinetic energy. The kinetic energy gained after touching the ground is also great.

The glass surface is smooth and the air resistance is small.

Of course, there are many other situations, such as jumping and then breaking, and breaking directly.