Answers

1. a) Matt is running at 150.653 m/sec when  he crosses the finish line.

    b) Matt is accelerating at 47.622 m/sec² when he crosses the finish line.

2. C

3. B

4. a) t=9 and t=15 because that’s where velocity changes sign

    b) The particle has traveled 205 feet after 18 minutes.

    c) The particle is 105 feet from its original location after 18 minutes.

5. B

6. a) The particle’s velocity at time t=10 is -9.041.

    b) The particle’s acceleration at time t=10 is -357.706.

    c) The particle is speeding up at time t=10 because v(10) and a(10) both have the            same sign.

7. D

8. The distance between John and Thomas is growing at a rate of 3.259 mph after 15 minutes of driving.

9. A

10. C