I Have an object with a mass of 30,000 lb falling at a height of 90ft. The object is to be stopped by a series of diaphragms spaced out 6" apart. I am using 1" welded plates as diaphrams. I need to find out how many plates it takes to stop the object. I have calculated my potential energy=kinetic energy to be 3.24x10^4 kip*in and the velocity at impact to be 76.101 ft*s^-1. Also each plate to have a weld capacity of 334 kip. I want to find out how many plates will the object shear before it stops.