The accident occurred during the student pilot's second landing on his first solo flight. He stated that the airplane was on a stabilized approach as it crossed over the runway threshold at 63 knots. He reduced engine power and began his landing flare as the airplane was abeam the Precision Approach Path Indicator (PAPI) system. He reported that the landing flare was "somewhat short" and that the airplane landed hard on its main landing gear. He reduced his backpressure on the control yoke and the nose wheel contacted the runway. The airplane then bounced several times, alternating between the nose and main landing gear, before stabilizing on a landing rollout. An after-flight inspection revealed the lower engine firewall and forward floorboards were substantially deformed. The student pilot reported that there were no preimpact mechanical malfunctions or failures that would have precluded normal operation of the airplane.