The forensic evidence contradicted Oscar Pistorius’ claim that he was wearing prosthetics at the time.
The door has been brought into court to be examined during the murder trial.
Oscar Pistorius denies intentionally killing Reeva Steenkamp on February 14 last year, saying he fired after mistaking her for a burglar.
A replica of the toilet in which Reeva Steenkamp was shot has been also brought into court.
The court will hear forensic evidence on the location of shooter, the grouping of the shots and their trajectory.
Cross-examining, Oscar Pistorius’ defense team asked the forensic expert to kneel on his knees and lift his feet, which caused him to wobble.
The defense team claimed that Mr Pistorius therefore would not have been able to balance on his stumps and break down the door using a cricket bat.
The prosecution witness argued that if Oscar Pistorius, 27, was balanced enough to fire a gun, he could also break down a door with a bat.
The trial is now halfway through its second week, and is expected to feature over 100 witnesses.
Earlier on Wednesday, a friend of Oscar Pistorius claimed that the star had driven at 124mph and that he had taken a picture of the speedometer to prove it.
The defense team alleged that Darren Fresco was himself driving at the time and had therefore fabricated evidence.
The state is seeking to convince the court that Oscar Pistorius and Reeva Steenkamp, a 29-year-old model, and reality TV star, had an argument before the athlete fired the shots that killed her.
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