The driver and the person seated in the front seat need a seat [[1]].

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Detailed Solution

The driver and the person seated in the front seat need a seat belt.
"Newton's first law asserts that a body will remain at rest or continue moving in a straight path at a constant speed unless acted upon by force, regardless of whether it is at rest or moving. This assumption is known as the law of inertia".
When a car accident happens, a fast-running car suddenly stops. Here the car's large momentum is reduced to zero in a very short time. The stretchable seat belts are tightened by the passengers and increase the time taken by the passengers to fall forward. Due to a long time, the rate of change of momentum of passengers is reduced, hence less stopping force acts on them. This idea underlies the requirement for seat belt use by the driver and the passenger in the front seat. So, the passengers may either not get injured at all or may get fewer injuries. Therefore the seat belts reduce the passengers' momentum more gently and prevent injuries.

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