Measure the depth using a metric ruler!
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First make sure that the bullet did not penetrate completly throught the material. Then use a thin rod to measure the depth of penetration in centimeters. Find out the type of bullet that penetrated, the gun type used and the material penetrated. Then use these linear equations represented by ballistic fingerprinting to subsitute y for depth of penetration per material. Find x, the energy used.
4x16x20cm= 1280 cubic cm
54 cm
Length X Width X Depth of the tank in centimeters, divided by 1000.
A cube has equal width, depth and height, so in this case the volume would be 2 x 2 x 2 (or 23) = 8 cubic cm (or cm3)