
Figure 21
At t = 0 s



rider
C is ahead of rider D.



rider
D is ahead of rider C.



riders
C and D are at the same position.




2

Figure 21
At t = 0 s



C
is moving, and D is at rest.



D
is moving, and C is at rest.



C
and D are both moving.



C
and D are both at rest.




3

Figure 21
At t = 0 s



C
has a greater velocity than D.



D
has a greater velocity than C.



C
and D have the same velocity.



C
is accelerating.



4

Figure 21
At t = 10 s



C
and D are at the same position.



C
and D have the same velocity.



the
velocity of D is greater than the velocity of C.



C
is in front of D.




5

Figure 22
During the first 8 s



C
has decreasing velocity and D has increasing velocity.



C
and D both have decreasing velocities.



C
and D have the same velocity.



C
has the same average velocity as D.




6

Figure 22
During the first 8 s



the
magnitude of the acceleration of C is greater than the magnitude of D's
acceleration.



their
accelerations are equal in magnitude but opposite in sign.



their
accelerations are equal in magnitude and equal in sign.




7

Figure 22
Based on all the graphical information



they
meet at the same position at t = 8 s.



they
will meet at the same position, at t = 10 s.



they
will never meet at the same position.



not
enough information is given to decide if they meet.




8

Which graph represents an object at rest?
















9

Which graph represents constant positive acceleration?
















10

How is motion in the negative x direction represented on an x vs. t plot?



By
a curve to the left of the origin.



By
a curve below the horizontal axis.



By
a downward sloping curve.



Such
a motion cannot be shown on a simple x vs. t graph.




11

What is the meaning of a horizontal line on a plot of v vs. t?



The
object is at rest.



The
object is moving at constant speed.



The
object is speeding up at a constant rate.



The
object is accelerating at a constant nonzero rate.




12

If a car accelerates from rest in the positive direction



its
final velocity is zero.



its
initial position is zero.



its
initial velocity is zero.



its
acceleration is negative.




13

A car accelerating from rest at 2.0 m/s^2 for 5 s



covers
a distance of 10 m.



has
a final speed of 10 m/s.



covers
a distance of 50 m.



has
an average velocity of 10 m/s.




14

In this problem "up" is taken to be positive.
A ball is dropped off a high cliff



and
its initial velocity is zero.



and
its final velocity is positive.



and
its acceleration is 9.8 m/s^2



and
its acceleration is 9.8 m/s




15

In this problem "up" is taken to be positive.
A ball is thrown straight up in the air, at the very top its



velocity
is negative.



acceleration
is zero.



its
acceleration is 9.8 m/s^2.



its
acceleration is 9.8 m/s^2




16

In this problem "up" is taken to be positive.
A vertically upward thrown rock has a



positive
initial velocity.



positive
final velocity.



positive
acceleration.



positive
final height.




17

In this problem "up" is taken to be positive.
A falling object has



positive
acceleration and positive velocity.



negative
acceleration and negative velocity.



positive
acceleration and negative velocity.



negative
acceleration and positive velocity.




18

In this problem "up" is taken to be positive.
An object moving upward under the influence of gravity has



positive
acceleration and positive velocity.



negative
acceleration and negative velocity.



positive
acceleration and negative velocity.



negative
acceleration and positive velocity.




19

In this problem "up" is taken to be positive.
A ball thrown vertically upward with an initial velocity of 19.6 m/s,
after 5 s has a final velocity of



19.6
m/s.



19.6
m/s.



29.4
m/s.



29.4
m/s.




20

An object is shot upward at 34.3 m/s. How high does it go?



60.0
meters



180.1
meters



102.9




21

Ball A is thrown vertically upward with a speed of 19.6 m/s from the top
edge of a high building. As it passes the edge on the way down, a second
ball, B, is thrown downward at 19.6 m/s. Which of the following is correct?



Ball
A hits the ground before B.



The
two balls hit the ground at the same time.



Ball
B hits the ground before A.




22

A car moving right to left applies the brakes. Its



velocity
and acceleration are both positive.



velocity
and acceleration are both negative.



velocity
is negative and its acceleration is positive.



Its
velocity is positive and its acceleration is negative.




23

A ball is dropped off a ledge. How far does it fall in the 2nd second?



4.9
meters



9.8
meters



14.7
meters



19.6
meters




24

Ball A is thrown upward at the same time as ball B and with half the speed
of ball B. Which of the following is true?



They
will hit the ground at the same time.



A
will hit before B.



B
will hit before A.




25

Ball A is thrown upward at the same time as ball B and with half the speed
of ball B. How much higher does B go than A?



8
times.



4
times.



2
times.



Not
enough information is given to answer this question.





