Answer :
The correct choice of the speed with which the human body will strike the seatbelt, windshield, steering wheel or dash is the choice:
The same speed as the vehicle.
The reason for the above choice is as follows:
According to Newton's First law of motion, an object will continue in its uniform motion in a straight line or in its rest state, unless a force acts on it.
The initial speed of a human body in a car having a collision, relative to people on the ground, is the speed of the car.
As the car collides and brought to a stop suddenly, the human body in the
car continues with the same speed as the vehicle until he is stopped by the
seatbelt, or steering wheel dash or windshield force.
Therefore, the human body will strike the closest part of the vehicle in front of him or her, at the same speed as the vehicle.
Learn more about Newton's First law of motion here:
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