There was now however , not enough fuel to speed up the atmospheric reentry and the spacecraft only entered the atmosphere at a speed of 33,000 feet per second ( 10,000 m\/s ) instead of the planned 37,000 feet per second ( 11,000 m\/s ) of a lunar return .
The spacecraft only entered the atmosphere at a speed of 33,000 feet per second ( 10,000 m\/s ) instead of the planned 37,000 feet per second ( 11,000 m\/s ) of a lunar return .