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## Homework Statement

Use this information to answer the next 4 questions: The brakes of a 1452 kg car bring it to a stop from a speed of 17.2 m/s in a distance of 100 m.

## Homework Equations

15. How much work do the brakes do?

2.15 x 105 J

1.42 x 106 J

2.50 x 106 J

7.12 x 105 J

16. What average force do the brakes apply?

2.50 x 104 N

7.12 x 103 N

2.15 x 103 N

1.42 x 104 N

17. How much distance would the car cover as it stops if the speed were doubled? Assume that the average braking force remains constant.

400 m

100 m

200 m

800 m

18. If the car originally stops in 6.2 s (100 m), what power is developed by the brakes?

23.4 kW

2.15 kW

34.7 kW

230 kW

## The Attempt at a Solution

I am so lost and I don't even know where to start with these. If you can help me I will be so grateful!!