# A car with a mass of #1000kg# initially moving at a rate of #20m/s# rolls to a stop. What is the work done by friction? What is the force of friction if it takes a distance of #20m# for the car to stop?

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The work done by friction is equal to the force of friction multiplied by the distance over which it acts. The force of friction can be calculated using the equation: force of friction = mass * acceleration. In this case, the acceleration can be calculated using the equation of motion: final velocity squared = initial velocity squared + 2 * acceleration * distance. Once the acceleration is found, the force of friction can be calculated. Then, using the work-energy principle, the work done by friction can be calculated using the equation: work done = force * distance.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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