A test car is driving toward a solid crash-test barrier with a speed of 45 mi/h. Two seconds prior to impact, the car begins to brake, but it is still moving when it hits the wall. After the collision with the wall, the car crumples somewhat and comes to a complete stop. In order to estimate the average force exerted by the wall on the car, what information would you need to collect?  a. The (negative) acceleration of the car before it hits the wall and the distance the car travels while braking.  b. The (negative) acceleration of the car before it hits the wall and the velocity of the car just before impact.  c. The velocity of the car just before impact and the duration of the collision with the wall.  d. The duration of the collision with the wall and the distance the car travels while braking.

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.