Five persons were injured, at least one critically, when a car plunged off the Southeast Freeway at New Jersey Avenue yesterday and landed on its top, authorities reported.

The impact of the fall flattened the top of the vehicle, trapping the occupants inside the car, according to police and rescue workers. It took 25 minutes to extricate them all.

In another incident, a 25-year-old Takoma Park woman was killed early yesterday morning when a cab crashed head-on into her car on East-West Highway at Rocton Avenue in Bethesda, Montgomery County police reported.

Police said the cab, operated by William Saddler, 26, of 847 21st St. NE, was traveling eastbound on East-WestHighway when it skidded and crossed the center lane crashing into a Volkswagen operated by Linda Flack, 25, of 8876 Piney Branch Road, Takoma Park.

After being extricated, two men, a woman and a child were taken to George Washington University Hospital, fire department ambulance personnel said. A second woman was taken to the Washington Hospital Center.

Further details of the 4:25 p.m., incident were not immediately available. Police said it was under investigation last night.

Sherry Virginia Haynes, of 4305 Kaywood Dr., Mount Rainer, a passenger in the Flack car, was also injured and is listed in critical condition at Suburban Hospital, a hospital spokesman said.

The driver of the cab, who worked for the Bell Cab Co. was not injured according to police. He was charged with negligent driving and failure to keep right of the center line.