D. a speeding up or slowing down
E. change of velocity

3. Which of the following is a scalar quantity?
A. Speed
B. Velocity
C. Displacement
D. Acceleration
E. None of these

4. Which of the following is a vector quantity?
A. Mass
B. Density
C. Speed
D. Temperature
E. None of these

5. Which of the following is NOT an example of accelerated motion?
A. Vertical component of projectile motion
B. Circular motion at constant speed
C. A swinging pendulum
D. Earth’s motion about sun
E. Horizontal
component of projectile motion

6. A particle goes from x = −2m, y =3m, z =1mto x =3m, y = −1m, z = 4m.
Its displacement is:
A. (1m)ˆi + (2m)ˆj + (5m) ˆk
B. (5m)ˆi −(4m)ˆj +
(3m) ˆk
C. −(5m)ˆi + (4m)ˆj −(3m) ˆk
D. −(1m)ˆi −(2m)ˆj −(5m) ˆk
E. −(5m)ˆi −(2m)ˆj + (3m) ˆk

7. A jet plane in straight horizontal flight passes over your head. When it
is directly above you, the sound seems to come from a point behind
the plane in a direction 30◦
from the vertical. The speed of the plane is:
A. the same as the speed of sound
B. half the speed of
sound
C. three-fifths the speed of sound
D. 0.866 times the speed of sound
E. twice the speed of sound

8. A plane traveling north at 200m/s turns and then travels south at
200m/s. The change in its velocity is:
A. zero
B. 200m/s north
C. 200m/s south
D. 400m/s north
E. 400m/s south

9. Two bodies are falling with negligible air resistance, side by side,
above a horizontal plane. If one of the bodies is given an additional
horizontal acceleration during its descent, it:
A. strikes the plane
at the same time as the other body.
B. strikes the plane earlier than the other body
C. has the vertical component of its velocity altered
D. has the vertical component of its acceleration altered
E. follows a straight line path along the resultant acceleration vector