Chapter 4
Newton's Three Laws

Solution 17

We know that the final velocity is zero and the distance traveled is 290 m. The initial velocity is the part we need to find, but first the acceleration must be calculated. To calculate the acceleration we must use the idea of friction. The only force that is slowing the car down is the friction. Therefore,

The friction force is .

Putting this into the first equation and solving for the acceleration gives:

Now we need to use one of the kinematic equations to solve for the initial velocity.

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