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This work is a theoretical study of the speed at which the material of animpacted target is ejected during the formation of an impact crater. Our model,starting from the first principle of thermodynamics, can describes the speed ofthe ejecta recursing to considerations that include complex process in simplecalculations. The fit of the model with observations shows that the manycomplex details implicit in an impact process could be included in some fewparameters. Ejecta speed could be described independent of impactor parameters.The model is compared with subsonic and supersonic speed experiments showingcoincidence in several cases. The model works with subsonic and supersonicimpacts. We do not compare the model with hypersonic impacts (> 5 km/s),however, as the model derivation no depends on the impactor velocity it islikely that also work with this kind of impacts.

Ejecta Speed with the Projectile Velocity less than 2 km/s