1. An object accelerates if it:
a. changes the direction of its velocity but not the magnitude
b. changes the magnitude of the velocity but not the direction
c. changes its speed
d. all of the above
e. none of the above
Answer: _____
2. A car starts from rest and in ten seconds is moving at 40 m/s. What is the car's acceleration?
a. 0.250 m/s2
b. 2.50 m/s2
c. 4.00 m/s2
d. 10.0 m/s2
e. 40.0 m/s2
f. none of the above
Answer: _____
3. An object, accelerating from rest at a constant rate, travels over 28 m in 11 s. What is its final velocity?
a. 1.81 m/s
b. 3.20 m/s
c. 5.09 m/s
d. 0.00 m/s
e. none of the above
Answer: _____
4. A car comes to a stop over a distance of 30.0 m after the driver applies the breaks. If the car decelerates at a constant rate of 3.50 m/s2, what was the car's original speed?
a. 10.2 m/s
b. 14.5 m/s
c. 105 m/s
d. 210 m/s
e. none of the above
Answer: _____
5. A stone is thrown straight up. What is its acceleration at the top of its trajectory?
a. 0 m/s2
b. about –5 m/s2
c. about –10 m/s2
d. about –20 m/s2
e. about –50 m/s2
f. Cannot be determined
Answer: _____
6. While the stone in the question above is rising:
a. its acceleration is upward and decreasing
b. its acceleration is upward and constant
c. its acceleration is upward and increasing
d. its acceleration is zero
e. None of the above
Answer: _____
7. An object is thrown upward with an initial velocity of 32.1 m/s. What is its velocity in 4 s? (use g = 9.81 m/s2)
a. –7.14 m/s
b. 11.2 m/s
c. 7.14 m/s
d. – 4.60 m/s
Answer: _____
8. When the object in the question above reaches it maximum height, it is true of the acceleration, a, and the velocity, v, that:
a. both its acceleration and velocity are zero
b. both its acceleration and velocity change sign
c. velocity is equal to zero, but acceleration is not
d. acceleration is equal to zero, but velocity is not
e. none of the above
Answer: _____
9. While accelerating at a constant rate from 12.0 m/s to 18.0 m/s, a car moves over a distance of 60.0 m. How much time does it take?
a. 1.00 s
b. 2.50 s
c. 4.00 s
d. 4.50 s
e. none of the above
Answer: _____
10. A sports car accelerates at a constant rate from rest to a speed of 90 km/hr in 8 s. What is its acceleration?
a. 3.13 m/s2
b. 4.22 m/s2
c. 5.31 m/s2
d. 6.67 m/s2
e. none of the above
Answer: _____
11. What distance does a train travel while slowing from 28 m/s to zero in 12 s?
a. 168 m
b. 178 m
c. 236 m
d. 291 m
e. none of the above
Answer: _____
12. What upward velocity must a basketball player have to jump 1.6 m off the floor? (use g = 9.8 m/s2)
a. 2.3 m/s
b. 3.8 m/s
c. 4.9 m/s
d. 5.6 m/s
e. none of the above
Answer: _____
13. If the instantaneous velocity of an object is zero, then its acceleration must be:
a. zero
b. positive
c. negative
d. 100 m/s2
e. not enough information
Answer: _____
14. Two objects are thrown from the top edge of a cliff with a speed of 10 m/s. One object is thrown straight down and the other straight up. If the first object hits the ground in 4.0 s, the second hits the ground in _____ after the first object.
a. 4.0 s
b. 3.5 s
c. 3.0 s
d. 2.0 s
e. none of the above
Answer: _____