On the shores of the Baltic Sea lay huge concrete slabs, all that remained of the coastal fortification.

On the shores of the Baltic Sea lay huge concrete slabs, all that remained of the coastal fortification. Ravens used these slabs in the following way: capturing oysters in shallow water, crows soared to a height of 30-40 m, threw shells on the slabs and quickly descended to the ground to eat oysters. What changes have occurred with the energy of oysters?

The crows raised them to a certain height, which means that the oysters had potential energy. After the throw, their speed increased, and the height decreased, which means that the potential energy turns into kinetic, but part of it is spent on overcoming the resistance forces.