In a head-on auto collision, the driver, who had his air bags disconnected, hits his head on the windshield, fracturing his skull. Assuming the driver’s head has a mass of 4.0 kg, the area of the head to hit the windshield to be 25 cm2, and an impact time of 3.0 ms, with what speed does his head hit the windshield? (Take the compressive fracture strength of the cranial bone to be 1.0 x 108Pa.)