Practice Quiz 2 Physics 101 Average Velocity Acceleration

Practice Quiz 2
Name_____________________________
1) A runner runs around a track consisting of two parallel lines 96 m long connected at the ends by two
semicircles with a radius of 49 m. She completes one lap in 100 seconds. What is her average velocity?
A) 2.5 m/s
B) 5.0 m/s
C) 10 m/s
D) 0 m/s
Answer: D
Figure 1

2) Figure 1 represents the position of a particle as it travels along the x-axis. What is the average speed of
the particle between t = 1 s and t = 4 s?
A) 1.0 m/s
B) 1.3 m/s
C) 0.67 m/s
D) 0.50 m/s
Answer: B

3) Figure 1 represents the position of a particle as it travels along the x-axis. At what value of t is the speed
of the particle equal to zero?
A) 1 s
B) 2 s
C) 3 s
D) 4 s
Answer: C

4) Figure 1 represents the position of a particle as it travels along the x-axis. How does the instantaneous
speed of the particle when t = 2 s compare with its speed when t = 4 s?
A) The speed at t = 2 s is larger.
B) The speed at t = 2 s is smaller.
C) They are about equal.
D) The speed at t = 4 s is the negative of the speed at t = 2 s.
Answer: C

5) Figure above represents the velocity of a particle as it travels along the x-axis. What is the average
acceleration of the particle between t = 1 second and t = 4 seconds?
A) 0.33 m/s2
B) 1.7 m/s2
C) 2.0 m/s2
D) 2.5 m/s2
Answer: B


6) At a given instant, the acceleration of a certain particle is zero. This means that
A) the velocity is constant.
B) the velocity is increasing.
C) the velocity is decreasing.
D) the velocity is not changing at that instant.
Answer: D


7) The velocity of a particle as a function of time is given by v(t) = (2.3 m/s) + (4.1 m/s2)t - (6.2 m/s3)t2.
What is the average acceleration of the particle between t = 1.0 s and t = 2.0 s?
A) -14.1 m/s2
B) -14.5 m/s2
C) 14.5 m/s2
D) 14.1 m/s2
Answer: B


8) A stone is thrown with an initial velocity of +7.0 m/s. The acceleration of the stone is constant and has
the value of -9.8 m/s2. What is the velocity of the stone after 0.50 s?
A) 2.1 m/s
B) 4.9 m/s
C) 11.9 m/s
D) -4.9 m/s
Answer: A


9) An airplane starts from rest and accelerates at 10.8 m/s2. What is its speed at the end of a 400 m-long
runway?
A) 37.0 m/s
B) 93.0 m/s
C) 65.7 m/s
D) 4320 m/s
Answer: B


10) A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes,
giving the car a deceleration of 3.50 m/s2. How far does the car travel after the driver put on the brakes
before it comes to a stop?
A) 4.57 m
B) 9.14 m
C) 112 m
D) 146 m
Answer: D

11) A stone is thrown straight up. When it reaches its highest point,
A) its velocity is zero m/s.
B) its acceleration is zero m/s.
C) both its velocity and acceleration are zero m/s.
D) neither is zero m/s.
Answer: A

12) Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John
stays in the air
A) 1.41 times as long.
B) twice as long.
C) three times as long.
D) four times as long.
Answer: B

13) Two athletes jump straight up. John has twice the initial speed of Harry. Compared to Harry, John
jumps
A) 1.41 times as high.
B) twice as high.
C) three times as high.
D) four times as high.
Answer: D

14) An object is thrown upwards with a speed of 14 m/s. How high above the projection point does it
reach?
A) 5.0 m
B) 10 m
C) 15 m
D) 20 m
Answer: B