Q: An airbag deploys in $$10\ \mathrm{ms}$$ and expands $$0.5\ \mathrm{m}. $$What is the acceleration of the front surface of the bag?

$$1 \times 10^4$\ \mathrm{m/s^2$}$$

Question 1

A car travels 100 m east, then 60 m west. What is the car's total distance traveled and its displacement?

Accepted Answer

Distance = 160 m, Displacement = 40 m east

Question 2

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

Accepted Answer

Average speed is always greater than or equal to the magnitude of average velocity.

Question 3

A runner completes one lap around a 400 m circular track in 80 s, ending at the starting point. What is the runner's average velocity?

Accepted Answer

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

Question 4

Given the velocity-time graph below (Image 2), what is the acceleration of the object?

Accepted Answer

$$0.33\ \mathrm{m/s^2$}$$

Question 5

A ball is thrown straight up with an initial velocity of $$20.0\ \mathrm{m/s}. $$How long does it take to return to the thrower's hand? (Use $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$4.1\ \mathrm{s}$$

Question 6

A car decelerates from $$12.0\ \mathrm{m/s} to $$rest at a rate of $$-3.5\ \mathrm{m/s^2$}. $$How far does it travel before stopping?

Accepted Answer

$$20.6\ \mathrm{m}$$

Question 7

Which kinematic equation would you use to solve for displacement when initial velocity, acceleration, and time are known?

Accepted Answer

$$x = x_0$ + v_0$ t + \frac{1}{2} a t^2$

Question 8

A plane lands at $$130\ \mathrm{m/s}$$ and must stop in $$750\ \mathrm{m}. $$What is the required acceleration?

Accepted Answer

$$-11.3\ \mathrm{m/s^2$}$$

Question 9

If an object moves with constant acceleration, which of the following is true about its position vs. time graph?

Accepted Answer

It is a parabola.

Question 10

A ball is dropped from rest from a height of $$120\ \mathrm{m}. $$How long does it take to hit the ground? (Ignore air resistance, $$g = 9.8\ \mathrm{m/s^2$})$$

Accepted Answer

$$4.95\ \mathrm{s}$$

Question 11

Which of the following best describes the motion of a car with positive velocity and negative acceleration?

Accepted Answer

The car is slowing down in the positive direction.

Question 12

The area under a velocity vs. time graph represents:

Accepted Answer

Displacement

Question 13

A car moves with a constant velocity of $$10\ \mathrm{m/s}$$ for $$5\ \mathrm{s}. $$What is its acceleration?

Accepted Answer

$$0\ \mathrm{m/s^2$}$$

Question 14

An airbag deploys in $$10\ \mathrm{ms}$$ and expands $$0.5\ \mathrm{m}. $$What is the acceleration of the front surface of the bag?

Accepted Answer

$$1 	imes 10^4$\ \mathrm{m/s^2$}$$

Question 15

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

Accepted Answer

The object is accelerating at a constant rate.

Question 16

A sprinter hears the starting gun from 100 m away. If sound travels at $$340\ \mathrm{m/s}$$, how long does it take for the sound to reach the sprinter?

Accepted Answer

$$0.29\ \mathrm{s}$$

Question 17

Which of the following is true for an object in free fall near Earth's surface (ignoring air resistance)?

Accepted Answer

The acceleration is $$9.8\ \mathrm{m/s^2$}$$ downward.

Question 18

A position vs. time graph is a straight line with a negative slope. What does this indicate?

Accepted Answer

The object is moving at constant velocity in the negative direction.

Question 19

If a car's velocity and acceleration are both negative, what is happening to the car?

Accepted Answer

It is speeding up in the negative direction.

One-Dimensional Kinematics: Motion in a Straight Line

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