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how to find the c part

A passenger of mass 50.0 kg is in a car which is moving with a velocity of 30.0 m s–1 . If the driver suddenly brakes the car, the passenger who is wearing a seat belt is pushed forward at a displacement of 0.500 m. [Neglect the effect of friction between the passenger and the seat of the car.] (a) What is the acceleration of the passenger? (b) What is the average pulling force of the seat belt on the passenger? (c) What is the time interval of the pulling force acted on the passenger?

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