What average force is required to stop a 1500 kg car in 9.0 s if the car is traveling at 95 km h?

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During the motion, the car has a constant acceleration. The force on the vehicle is equal to the product of the mass and acceleration.

Given data:

The mass of the car is .

The time to move the car is .

The initial speed of the car is

The final speed of the car is as the car stops at the end.

Assumption:

Let a be the acceleration of the car.

The acceleration of the car is

Therefore, from Newton’s second law, you get that the average force on the car is

(Negative value of the average force means that the average force is against the direction of the initial velocity.)

Hence, the average force on the car is 3135 N.

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