Accelerated Motion
Practice Test
1.
__________ is the change in velocity divided by the time needed for the change to occur.
a.
Average velocity
b.
Average acceleration
c.
Speed
d.
Displacement
Hint
2.
A tennis ball is dropped from 1.5 m above the ground, touches the ground for 0.008 s and rebounds to a height of 0.75 m. What is the ball's velocity when it hits the ground?
a.
-3.8 m/s
b.
3.8 m/s
2
c.
-5.4 m/s
2
d.
-5.4 m/s
Hint
3.
A 75-kg swimmer steps off a 10.0-m tower. What is the swimmer's velocity on hitting the water?
a.
0.25 m/s
b.
-14.0 m/s
c.
27.1 m/s
d.
38.3 m/s
Hint
4.
How far does a car travel in 30.0 s while its velocity is changing from 50.0 km/h to 80.0 km/h at a uniform rate of acceleration?
a.
252 m
b.
1.08 × 10
3
m
c.
1.95 × 10
3
m
d.
5.40×10
2
Hint
5.
The
a-t
graph corresponding to the
v-t
graph in Figure 3-10a would be ___.
a.
A straight horizontal line above the
t
axis
b.
A straight line with a constant positive slope
c.
A line beginning at the origin with increasing positive slope
d.
A straight vertical line
Hint
6.
A car moving north at 8.0×10
1
turns and travels south at 65 km/h. What are the magnitude and direction of the change in velocity?
a.
25 km/h, north to south
b.
145 km/h, north to south
c.
145 km/h, south to north
d.
25 km/h
Hint
