Question 1

A train is moving east at 100 mph. A passenger walks toward the front of the train at 3 mph relative to the train. What is the passenger's velocity relative to the ground?

Accepted Answer

$$103\ 	ext{mph}$$

Question 2

A runner moves from $$x_1 = 30$$\ 	ext{m}$$ to x_2$ = 10\ 	ext{m}$$ along a straight path. What is the displacement?

Accepted Answer

$$-20\ 	ext{m}$$

Question 3

A car travels 400 m along a U-shaped curve in 30 s, ending 40 m north of its starting position. What is the magnitude of its average velocity?

Accepted Answer

$$1.33\ 	ext{m/s}$$

Question 4

Which of the following statements about velocity and speed is correct?

Accepted Answer

Velocity can be negative, but speed cannot.

Question 5

A position vs. time graph has a positive, constant slope. What does this indicate about the object's motion?

Accepted Answer

The object is moving with constant positive velocity.

Question 6

A car accelerates from rest at $$a = 2.0\ 	ext{m/s}^2$$ for $$4.0\ 	ext{s}. $$What is its velocity after $$4.0\ 	ext{s}$$?

Accepted Answer

$$8.0\ 	ext{m/s}$$

Question 7

A ball is thrown straight up. At the very top of its path, what is its acceleration (choose upward as positive)?

Accepted Answer

$$-9.8\ 	ext{m/s}^2$$

Question 8

A bicycle is traveling at $$12.0\ 	ext{m/s}$$ when the rider applies the brakes, producing a constant acceleration of $$-3.0\ 	ext{m/s}^2. $$How far does the bicycle travel before coming to rest?

Accepted Answer

$$48\ 	ext{m}$$

Question 9

Which of the following is an example of acceleration?

Accepted Answer

All of the above.

Question 10

A ball is dropped from a height of $$155\ 	ext{m} ($$neglect air resistance). What is its velocity just before it hits the ground? (Take $$g = 9.8\ 	ext{m/s}^2$$ and downward as positive.)

Accepted Answer

$$55.2\ 	ext{m/s}$$

Question 11

Which term in the equation $$\Delta x = v_0$ t + \frac{1}{2} a t^2$ is responsible for the curved shape of the position-time graph for constant acceleration?

Accepted Answer

$$\frac{1}{2} a t^2$

Question 12

A car’s velocity is directed to the west and so is its acceleration. What is happening to the car?

Accepted Answer

Speeding up, headed west

Question 13

Which of the following controls on a car can cause it to accelerate?

Accepted Answer

All of the above

Question 14

A ball is tossed upward and travels 1.0 m up and then 1.0 m back down in 1.0 s. What is its average velocity?

Accepted Answer

$$0\ 	ext{m/s}$$

Question 15

Which equation would you use to find the final velocity of an object after traveling a certain distance under constant acceleration, without knowing the time?

Accepted Answer

$$v^2$$ = $$v_0^2 + 2 a$$ \Delta x$$

Question 16

Two balls are released from the same height: Ball A is dropped, Ball B is thrown downward. Which hits the ground with the greater speed?

Accepted Answer

Ball B

Question 17

On a velocity vs. time graph, what does a straight line with a positive slope represent?

Accepted Answer

Constant acceleration

Question 18

A baseball is tossed vertically upward with an initial speed of $$50\ 	ext{m/s}. $$What is its velocity at the top of its path?

Accepted Answer

$$0\ 	ext{m/s}$$

1D Kinematics: Describing Motion in One Dimension

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