here is an example of one of the problems:

**Library/Michigan/Chap5Sec1/Q15.pg**

A student is speeding down Route 11 in his fancy red Porsche when his radar system warns him of an obstacle 400 feet ahead. He immediately applies the brakes, starts to slow down, and spots a skunk in the road directly ahead of him. The "black box" in the Porsche records the car's speed every two seconds, producing the following table. The speed decreases throughout the 10 seconds it takes to stop, although not necessarily at a uniform rate.

Time since brakes applied (sec) | 0 | 2 | 4 | 6 | 8 | 10 |

Speed (ft/sec) | 120 | 70 | 50 | 20 | 15 | 0 |

**A.** What is your best estimate of the total distance the student's car traveled before coming to rest (note that the best estimate is probably not the over or under estimate that you can most easily find)?

distance = (include units)

**B.**Which one of the following statements can you justify from the information given?

**A.**The "black box" data is inconclusive. The skunk may or may not have been hit.

**B.**The car stopped before getting to the skunk.

**C.**The skunk was hit by the car.

the answer is 430 feet but webwork doesnt see the ft at the end no matter what I do...

whats up with that?