PART A: Short Answer Questions

Can an object ever be accelerating and experiencing an instantaneous velocity of 0 m/s? Explain.

Is it possible to have an average velocity of 0 for some motion but an average speed of 120 km/h for that motion? Provide an quantitative example.

Sketch an impossible position-time graph and explain why it is impossible. Then, sketch an impossible velocity-time graph and explain why it is impossible.

PART B: Problem-Solving

1. A soccer ball is kicked 31 m [South]. The ball is then kicked 21 m [S35oW]. What is the resultant displacement of the ball?

2. A rocket powered sled accelerates a jet pilot in training from rest to 250 km/h [fwd] in 11.1 s. find:

(a) the acceleration of the sled

(b) the time it takes to reach the highway speed limit, 100.0 km/h[fwd]

(c) the total displacement travelled

3. A rock is dropped from the top of the Burj Khalifa (World's tallest building), 829.8 m above the ground.

a) How fast will the rock be traveling just before striking the ground?

b) How long will it take the rock to hit the ground?

PART C: Multiple Choice

1. A ball is thrown to the north and is experiencing projectile motion. What are the

directions of the acceleration and instantaneous velocity, respectively, of the ball at maximum height (e.g., the peak of its trajectory)?

a) north, north

b) up,north c) down,north

d) north, down

e) down, down

2. A cyclist cycles 40.0 km [North] and then 30.0 km [East]. The total time taken for the trip is 1.00 h. What is its average velocity?

a) 50 km/h [37oEast of North]

b) 70 km/h [37oEast of North]

c) 35 km/h [37oEast of North]

d) 15 km/h [37oEast of North]

e) None of these choices

3. A car is travelling west and approaching a stop sign. As it is slowing to a stop, the directions associated with the object's velocity and acceleration, respectively, are

a) [West], [East] b) [West], [West] c) [East],[East] d) [East], [West] e) There is not enough information to tell.

4. A sprinter travels around a 400 m oval track 4 complete times. Her distance and displacement are, respectively,

a) 0,0 b) 1600m,0 c) 0,1600m d) 1600 m, 1600 m [forward] e) 100m,0

5. If a car travelling at 60.0 km/h [S] stops in a time of 3.50 s, its acceleration is:

a) 4.77 m/s2[S] b) 4.77m/s2[North] c) 16.7 m/s2[S]

d) 16.7 m/s2[North]

e) 17.1 m/s2[S]

6. Which of the following objects are in "free fall"? (assume no air resistance)

a) a ball that was thrown horizontally b) a ball that was thrown at an angle above horizontal

c) a bal that was thrown at an angle below horizontal

d) a ball that was dropped e) all of the above

7. A baseball player is trying to determine her maximum throwing distance. She must release the ball:

a) at an angle that lets the ball reach the highest possible height

b) horizontally c) at an angle of 45 d) so that it has maximum possible speed, regardless of angle

e) at an angle between 45and 90

8. A car travels 35 km [North] in 30 minutes and then hits a traffic jam and spends 1.5 hours travelling 16.7 km/h [North]. The average velocity of the car is:

a) 43.35km/h[North]

b) 51.7 km/h [North]

c) 16.7m/s[North]

d) 8.34 m/s [North]

e) 0

9. A ball is thrown up in the air and then caught at the same height. The acceleration is 9.8 m/s2[down] _____________

a) onthewayup b) onthewaydown c) at the peak of its trajectory d) two of A, B, and C are correct

e) all of A, B, and C are correct

10.A boy throws a ball straight up off a second floor balcony and it then lands on the ground. Neglecting air resistance, the magnitude of velocity is greatest:

a) just after it leaves the boy's hand b) at the peak of the ball's trajectory c) just before it hits the ground d) it remains the same through out the motion e) impossible to tell without knowing the angle of projection

PART D: Graphing Use the velocity-time graph below to answer the questions that follow.