Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.


1.

A
train travels 6 meters in the first second of travel, 6 meters again during the second second of
travel, and 6 meters again during the third second. Its acceleration is a.  0
m/s^{2}.  b.  6 m/s^{2}.  c.  12
m/s^{2}.  d.  18 m/s^{2}.  e.  none of the
above   


2.

A car
starts from rest and after 7 seconds it is moving at 42 m/s. What is the car’s average
acceleration? a.  0.17
m/s^{2}  b.  1.67 m/s^{2}  c.  6
m/s^{2}  d.  7 m/s^{2}  e.  none of the
above   


3.

Suppose you take a trip that covers 180 km and takes 3 hours to make. Your average
speed is a.  30
km/h.  b.  60 km/h.  c.  180
km/h.  d.  360 km/h.  e.  540
km/h.   


4.

Suppose a car is moving in a straight line and steadily increases its speed. It moves
from 35 km/h to 40 km/h the first second and from 40 km/h to 45 km/h the next second. What is the
car's acceleration? a.  5 km/h·s  b.  10
km/h·s  c.  35 km/h·s  d.  40
km/h·s  e.  45 km/h·s   


5.

A
ball is thrown straight up. At the top of its path its instantaneous speed is a.  0
m/s.  b.  about 5
m/s.  c.  about 10
m/s.  d.  about 20
m/s.  e.  about 50
m/s.   


6.

A
ball is thrown straight up. At the top of its path its acceleration is a.  0
m/s^{2}.  b.  about 5 m/s^{2}.  c.  about 10
m/s^{2}.  d.  about 20 m/s^{2}.  e.  about 50
m/s^{2}.   


7.

When
something falls to the ground, it accelerates. This acceleration is called the acceleration due to
gravity and is symbolized by the letter g. What is the value of g on Earth's
surface? a.  0
m/s^{2}  b.  about 5 m/s^{2}  c.  about 10
m/s^{2}  d.  about 20 m/s^{2}  e.  about 50
m/s^{2}   


8.

A car
accelerates at 2 m/s^{2}. Assuming the car starts from rest, how much time does it need to
accelerate to a speed of 20 m/s? a.  2 seconds  b.  10
seconds  c.  20 seconds  d.  40
seconds  e.  none of the above   


9.

If a
freely falling object were somehow equipped with a speedometer, its speed reading 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.  a rate that depends on its initial
speed.   

Essay


10.

Write
a short paragraph explaining what acceleration is and why a car is accelerating as it rounds a
corner.

Problem


11.

What
is the average speed of a cheetah that runs 88 m in 5 seconds?


12.

A
bicycle travels 15 km in 30 minutes. What is its average speed?


13.

What
is the average acceleration of a car that goes from rest to 60 km/h in 8 seconds?


14.

A jet
on an aircraft carrier can be launched from 0 to 40 m/s in 2 seconds. What is the acceleration of the
jet?


15.

A
skateboarder starting from rest accelerates down a ramp at 2 m/s^{2 }for 2 s. What is the
final speed of the skateboarder?


16.

Starting from rest, a car undergoes a constant acceleration of 6 m/s^{2.}. How
far will the car travel in the first second?
