16. What is the acceleration of a car that maintains a constant velocity of 55 mi/hr for 10.0 seconds?
a. 0
b. 5.5 mi /hr/s
c. 5.5 mi /s/s
d. 550 mi/hr/s

17. As an object freely falls, it's .
a. speed increases
b. acceleration increases
c. both of these
d. none of these

18. A speedometer is placed upon a free-falling object in order to measure its instantaneous speed during the course of its fall. Its speed reading (neglecting air resistance) would increase each second by .
a. about 5 m/s
b. about 10 m/s
c. about 15 m/s
d. a variable amount
e. depends on its initial speed.

19.Ten seconds after being dropped from rest, a free-falling object will be moving with a speed of .
a. about 10 m/s.
b. about 50 m/s.
c. about 100 m/s.
d. more than 100 m/s.

20. A baseball pitcher delivers a fastball. During the throw, the speed of the ball increases from 0 to 30.0 m/s over a time of 0.100 seconds. The average acceleration of the baseball is m/s2.
a. 3.00
b. 30.0
c. 300.
d. 3000
e. none of these

21. On takeoff, a rocket accelerates from rest at a rate of 50.0 m/s2 for exactly 1 minute. The rocket's speed after this minute of steady acceleration will be m/s.
a. 50.0
b. 500.
c. 3.00 x 103
d. 3.60 x 103
e. none of these

22. When a rock is dropped, it will accelerate downward at a rate of 9.8 m/s2. If the same rock is thrown downward (instead of being dropped from rest), its acceleration will be . (Ignore air resistance effects.)
a. less than 9.8 m/s2
b. 9.8 m/s2
c. more than 9.8 m/s2