1. An elevator travels a distance of 220 m from the 1st floor to
the 60th floor in 27.5 sec. What is the elevator’s average
speed?
2. Jesse runs the mile (1609 m) with an average speed of 5.4
m/s. How much time (in seconds) does it take him to
complete this race?
3. What is the velocity of a boat that travels 220 meters west
from the shore in 12.5 seconds?
4. From rest, a sprinter reaches a top speed of 10 m/s in a
time of 4 seconds. What is her average acceleration?
5. A bullet is shot form a rifle with a speed of 720 m/s. What
is the time required for the bullet to strike a target 3240
meters away?
6. A rocket launched into outer space travels 240,000 km
during the first 6 hours after launching. What is the average
speed of the rocket?
7. On a baseball diamond, the distance from home plate to
the pitcher’s mound is 18.5 meters. If the pitcher throws a
ball at 38.5 m/s, how much time does it take a thrown ball
to reach home plate?
8. What is the acceleration of a racing car that decreased its
speed from 66 m/s to 44 m/s over an 11 second time
period?
9. A train moving west at a velocity of 15 m/s is accelerated to
17 m/s over a 12 second period. What is the acceleration?
10. What is the acceleration of an auto if its speed is increased
from 85 m/s to 95 m/s during a 15 second time period?
11. A plane started from rest accelerates to its takeoff speed
of 72 ft/s during a 5 second interval. What is the plane’s
acceleration?
12. During a canoe race a boy paddles a distance of 512 m in
60 seconds. What is his average speed?
13. In an emergency, a driver brings a car to a full stop in 8
seconds. At the beginning of the braking period, the car
was traveling at a speed of 21 m/s. What is the car’s
acceleration?
14. An athlete swims from the north end to the south end of a
pool in at an average speed of 2.50 m/s. If it took the
swimmer 20 seconds to do this, what is the length of the
pool?
15. The Sears Tower in Chicago is 443 meters tall. Joe wants
to set the world’s stair climbing record and runs all the way
to the roof of the tower. If Joe’s average speed is 0.60 m/s,
how long will it take Joe to climb to the top?
16. The cheetah is the fastest mammal on Earth. Cheetahs
have been clocked running a distance of 0.55 kilometers
with an average speed of 100 km/h. How much time (in
hours) would it take the cheetah to run this distance at this
speed?
17. The peregrine falcon is the fastest of flying birds (and, as a
matter of fact, is the fastest living creature). If the falcon
can fly 1.73 km in 25 seconds, what is the average speed of
this bird?
18. The black mamba is one of the world’s most poisonous
snakes, and one of the fastest, too. Suppose a mamba
waiting in a hide-out sees prey and begins slithering toward
it. In 2.5 seconds, it traveled 45 meters to attack the prey.
What was the speed of the snake?
19. A pronghorn antelope has been observed to run with a top
speed of 97 km/h. Suppose an antelope runs 1.5 km. How
much time would it take to run this distance?
20. A squirrel runs 4.2 meters south across a lawn, stops, then
runs back 2.4 meters in the opposite direction. What is the
squirrel’s displacement from its starting point?
21. You are in a car traveling an average speed of 65 km/h.
The total trip is 365 km. How much time did it take for the trip?
22. A ball is dropped form a cliff and reaches a speed of 29.4
m/s after 3 seconds. What is the average acceleration of the
ball?
23. A boy on a skateboard increases his speed from 13 ft/s to
20 ft/s in a time of 4.5 seconds. What is his average
acceleration?
24. A skydiver’s velocity increases from 9.4 m/s to 39.0 m/s in
3.0 seconds. What was his acceleration?
25. A satellite’s speed is 10,000 m/s. After 65 seconds, it is
5,000 m/s. What is the satellite’s acceleration?
26. A cyclist leaves home and rides east for a distance of 45
km. She returns home on the same path. If the entire trip
takes 4 hours, what is her average speed?
27. A skier is going down a hill at a speed of 9 m/s. The hill gets
steeper and her speed increases to 18 m/s in 3 seconds. What
is her acceleration?
28. Sound travels at a speed of 330 m/s. How long does it take
for the sound of thunder to travel 1,485 meters?
CHECK YOUR ANSWERS BELOW……………
1. 8 m/s
2. 298 s
3. 17.6m/s
4. 2.5 m/s2
5. 4.5 s
6. 40,000 km/h
7. 0.48 s
8. -2 m/s2
9. 0.17 m/s2 west
10.
0.67 m/s2
11.
14.4 ft/s2
12.
8.53 m/s
13.
-2.63 m/s2
14.
50 m
15.
738.3 s
16.
0.0055 s
17.
0.07 km/s
18.
18 m/s
19.
0.02 h (about 55 seconds)
20.
1.8 m south
21.
5.62 h
22.
9.8 m/s2
23.
1.56 ft/s2
24.
9.87 m/s2
25.
-76.9 m/s2
26.
22.5 km/h
27.
3 m/s2
28.
4.5 s