WHILE DRIVING AT 5-10 MPH ANOTHER VEHICLE TRAVELING AT 35 MPH REAR ENDED CONSUMER'S VEHICLE. DRIVER'S SEATBACK FELL INTO A CHILD BOOSTER SEAT WHICH WAS PLACED BEHIND ON DRIVER'S SIDE. SEAT FELL ON TOP OF CHILD'S LEG AND BROKE LEG. PLEASE PROVIDE FURTHER INFORMATION. *AK