How would you solve these problems?

Question

Level 1

Q1

A train travels north at 103 km/h. This is an example of:

1. Velocity 
2. Speed
3. Acceleration 
4. Speed and Acceleration 

Q3

If John walks 11.5 meters east in 7.1 seconds, what is John’s velocity?

1. 0.6 m/s East
2. 0.6 m/s West
3. 1.6 m/s West
4. 1.6 m/s East

Q2

What is the speed of a rocket that travels 9,000 meters in 12 seconds?

1. 0.001 seconds
2. 750 seconds
3. 750 m/s
4. 108,000 m/s

Q4

In 17.2 seconds, a shopping cart is pushed 15.6 meters towards the right. What is the velocity of the cart?

1. 1.6 m/s to the right
2. 0.9 m/s to the right
3. 1.1 m/s to the right 
4. 1.6 m/s to the left

Level 2

Q1

Light travels at 300,000,000 m/s. This is an example of:

1. Velocity
2. Displacement
3. Speed
4. Distance 

Q2

Annie runs at a velocity of 3.5 m/s north for 15 seconds. What is her displacement?

1. 4.29 meters north
2. 52.5 meters north
3. 52.5 m/s
4. 4.29 m/s

Q3

Which is an example of a vector quantity?

1. Speed
2. Distance
3. Mass
4. Velocity

Q4

Which is a scalar quantity?

1. Velocity 
2. Displacement
3. Acceleration
4. Distance

Answer 1

Hi, Bob,

I've provided information as underlined sentences in each question.

I hope it helps,

Bob

Q1

A train travels north at 103 km/h. This is an example of: Velocity, since the train is both moving (speed) and has a direction.

1. Velocity 
2. Speed
3. Acceleration 
4. Speed and Acceleration 

Q3

If John walks 11.5 meters east in 7.1 seconds, what is John’s velocity? Divide the distance (11.5 meters) by the time (7.1 seconds) to get the answer (in m/s). Include the correct direction in the answer.

1. 0.6 m/s East
2. 0.6 m/s West
3. 1.6 m/s West
4. 1.6 m/s East

Q2

What is the speed of a rocket that travels 9,000 meters in 12 seconds? Same as above (9000m/12 sec), but this time no direction is specified. (Just assume it is towards you, but take your time). Pick the answer that has the correct units.

1. 0.001 seconds
2. 750 seconds
3. 750 m/s
4. 108,000 m/s

Q4

In 17.2 seconds, a shopping cart is pushed 15.6 meters towards the right. What is the velocity of the cart? Divide the distance by the time, as above. Since they want velocity, not just speed, pick the answer that has the correct direction.

1. 1.6 m/s to the right
2. 0.9 m/s to the right
3. 1.1 m/s to the right 
4. 1.6 m/s to the left

Level 2

Q1

Light travels at 300,000,000 m/s. This is an example of: Velocity has a direction, speed is simply a scalar - a measure without direction.

1. Velocity
2. Displacement
3. Speed
4. Distance 

Q2

Annie runs at a velocity of 3.5 m/s north for 15 seconds. What is her displacement? Note that the question asks for displacement (distance and direction). Look at the units and you'll see that to get the distance you need to multiply one times the other. Also make sure the direction is correct.

1. 4.29 meters north
2. 52.5 meters north
3. 52.5 m/s
4. 4.29 m/s

Q3

Which is an example of a vector quantity? A vector has a direction assigned to it. Measures that only tell the magnitude of something are scalars. Think of the difference between speed and velocity. Speed tells you nothing about direction.

1. Speed
2. Distance
3. Mass
4. Velocity

Q4

Which is a scalar quantity? One that does not involve a direction.

1. Velocity 
2. Displacement
3. Acceleration
4. Distance