Mass = Density x Volume
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the area of the triangular face (0.5 x base x height) times the length of the prism * * * * * No. That will only give the volume which is not the same as the mass. You will either need to assume that the prism is of uniform density. In that case, you multiply its volume by the density. Alternatively, you follow Archimedes' principle to determine the density or even the weight of the prism. Then you need to convert to mass by dividing by the force of gravity. Not as easy as the first answer wrongly made it look.
times it together
Pressure=mass/unit area
Volume= Length x Height x thickness = Mass ---------- Density So, Thickness = Mass ---------------------------------- Density x Length x Height
This would be the standard formula for calculating momentum. P represents momentum which is calculated by mass * velocity.