How Expert find the speed of an accident car?

Hello friends,
Is video me baat karenge ki vehicle ka accident hone par expert us vehicle ki speed kaise pata karte hain, aur kaun si sciencetific theory ka use karte hai, in sabki jaankari ke liye aap is video ko zaroor dekhein.
car accident,
vehicle speed,
car speed detection,
car accident,
vehicle speed detector,
car radar,
Black box,
satellite,

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Видео How Expert find the speed of an accident car? канала GCC Help