Acceleration
Name _______________________
Show your work on all problems!!! Ignore friction on all problems. Use g = 10 m/s/s
1. A motorcycle goes form 0 mi/hr to 62 mi/hr in 4.5 seconds, what is its acceleration?
2. A car’s brakes slow it down from 55 mi/hr to 22 mi/hr in 6.2 seconds, what is its acceleration?
(remember that a negative number for acceleration means that the object is slowing down)
3. If a car accelerates at 13 mi/hr/s, how fast will it be going 5.0 seconds after the light turns
green?
4. Dr. Bones fall off a Styrofoam cliff on one of those weird Star Trek planets. Mr. Spock
measures his velocity and finds him to be falling at 48 m/s after 3.92 seconds.
How fast does this planet cause falling objects to accelerate?
5. Given that Earth’s gravity both speeds up and slows down objects at the rate of 10 m/s/s, how
long would a football move upward if it left the punter’s foot at a velocity of 24.5 m/s?
6. The Guinness Book of World Records states that the fastest acceleration for a street vehicle
was 0 mi/hr to 60.0 mi/hr in 4.1 seconds. How fast is this acceleration?
7. Guinness Book also reports that a man survived a fall from a 56 meter high cliff. If, as they
say, he was traveling at 33.1 m/s when he hit the ground and came to a stop in 0.015 seconds
(was someone standing there with a stopwatch or something?), what was his acceleration?
8. A rather careless person drops a bowling ball out of an airplane. After falling for 5.0 seconds
what is the bowling ball’s
a) acceleration?
b) velocity?
9. A jet is traveling 398 m/s when it launches a missile that accelerates at 36.7 m/s/s. If the
missile hits its target 7.4 seconds after it is launched, how fast is the missile going when it
hits?
10.
A rifle is fired straight upwards. If it has a velocity of 606 m/s when it leaves the barrel of
the gun, how long will it continue to climb upwards?
11.
A car is traveling at 68 mi/hr when its radar alert goes off. The speed limit is 45 mi/hr. If
the car’s brakes slow it down at –7.0 mi/hr/s, low long will it take it to reach a legal speed?
Questions 12 – 17 refer to the motion graph above.
12. What was the acceleration of the object during segment AB?
13. How fast was the object traveling at the 3 second mark?
14. How fast was the object accelerating at the 3 second mark?
15. Which segment shows the object stopped?
16. Which segment shows the object traveling at a constant velocity?
17. Which segment shows the object slowing down?