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Newton's second law applies to any body in motion, and as such, yes it applies to a passenger in a vehicle. A person in a vehicle is travelling at the same velocity that the vehicle they are travelling in is. When the vehicle speeds up or slows down the effective velocity of the passenger does as well. When the car turns the passenger is subject to the same centripetal force that the car is subject to.
External forces applied to the car are transferred to the passenger only if some part of the vehicle exerts that force on the passenger (like a seat belt). This explains why when a car comes to an abrupt stop, the passenger is still moving forward unless some part of the vehicle no longer in motion exerts a force on the passenger.
Yes it does!!!
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