text: ok so your trying to find a stress.\nstress is force/area\nyou alread have an area, so lets work on a force\nforce is mass x acceleration\nyou have a mass, so lets find an acceleration\nAcceleration is the change in speed with respect to time\ndv/dt or delta V/delta t\nyour delta V is 80km/hour and your delta t is 5.2 ms\n\nlets put these in the proper units and solve:\n80km/hr*(1000m/km)*(1hr/3600sec)=22.222m/sec\ntime = 5.2ms(1s/1000ms)=.0052sec\nacceleration=4273.504m/s2\n back to mass\nF=ma=3.0kg*4273.504m/s2=12820.5128 Newtons\n\nback to area\n2.7cm2*(1m2/10000cm2)=.00027m2\n\nStress then equals 12820.5128/.00027\n47,483,380.740 Pascals or 47.483 GPa