Average Velocity

Q. Define Velocity ?

Q. State whether speed is a scalar or a vector quantity. Give reason for your choice.

Q.

A body goes from C to D with a velocity of $20m/s$ and comes back from D to C with a velocity of $30m/s$. The average velocity of the body during the whole journey is

1. 25 m/s

2. Zero

3. 24 m/s

4. 26 m/s

Q.

Average velocity is _____.

1. Zero in round trip

2. Non zero in round trip

3. Maybe zero or non zero depending on the distance

4. Maybe zero or non zero depending on the speed

Q.

The ratio of average velocity to average speed is always _____ one.

1. greater than

2. less than or equal to

3. greater than or equal to

4. less than

Q. A train $50m$ long passes over a bridge at a velocity of $30km/h$. If it takes $36s$ to cross the bridge, the length of the bridge will be

1. $200m$
2. $100m$
3. $250m$
4. $300m$

Q.

A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. The velocity at the end of seventh second from start is

1. 15 cm/s

2. 10 cm/s

3. 5 cm/s

4. 20 cm/s

Q. Speed is a vector quantity.

1. True
2. False

Q. Average velocity and average speed is same for:

1. A flight travelling between Delhi to Kolkata.
2. A car making a round trip on a circular track.
3. A one-way trip on a straight road.
4. A car going from Delhi to Mumbai on a zig-zag road.

Q. Question 2
Joseph jogs from one end A to the other end B of a straight 300 m road in 2 minutes 50 seconds and then turns around and jogs 100 m back to point C in another 1 minute. What are Joseph’s average speeds and velocities in jogging (a) from A to B and (b) from A to C?

Q.

A car starts from Bangalore to Mumbai and returns back to Bangalore in $20hrs$. When started the odometer reading was $2200km$ and when finished it was $3800km$. Find the average velocity and average speed of the car?

1. Average Velocity : 0km/hr, Average Speed : 0 km/hr

2. Average Velocity : 0km/hr, Average Speed : 80 km/hr

3. Average Velocity : 80km/hr, Average Speed : 80 km/hr

4. Average Velocity : 80km/hr, Average Speed : 0 km/hr

Q.

Which of the following statements are correct for a round trip along the circular route?

1. Average speed is zero in a round trip

2. Average velocity and average speed, both are non-zero

3. Average velocity is zero in a round trip

4. Average velocity is non-zero because displacement is non-zero.

Q. When a body is moving in a circular path with a constant speed, does it possess acceleration? Why or why not?
[2 MARKS]

Q. Question 1
Distinguish between speed and velocity.

Q. The average velocity and the average speed would remain the same for:

1. A train travelling between two cities on a linear track
2. A girl swimming linearly in a pool.
3. A car travelling on a straight road
4. A toy train making a round trip on a circular track

Q. The average velocity and the average speed would remain the same for:

1. A car travelling on a straight road
2. A toy train making a round trip on a circular track
3. A girl swimming linearly in a pool.
4. A train travelling between two cities on a linear track

Q. The average velocity and the average speed would remain the same for:

1. A train travelling between two cities on a linear track
2. A car travelling on a straight road
3. A toy train making a round trip on a circular track
4. A girl swimming linearly in a pool.

Q. The average velocity and the average speed would remain the same for:

1. A toy train making a round trip on a circular track
2. A car travelling on a straight road
3. A train travelling between two cities on a linear track
4. A girl swimming linearly in a pool.

Q.

A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. The velocity at the end of seventh second from start is

1. 10 cm/s

2. 5 cm/s

3. 20 cm/s

4. 15 cm/s

Q. If the units of length and time are doubled then unit of speed will

1. Get doubled
2. Get halved
3. Becomes one-third
4. Remains same

Q. Speed is a vector quantity.

1. False
2. True

Q.

A car starts from Bangalore to Mumbai and returns to Bangalore again in 20hrs. What are the average velocity and average speed of the car if odometer reading of the car, when it started was 2200 km and when finished was 3800 km?

1. Average Velocity : 0km/hr, Average Speed : 0 km/hr

2. Average Velocity : 0km/hr, Average Speed : 80 km/hr

3. Average Velocity : 80km/hr, Average Speed : 80 km/hr

4. Average Velocity : 80km/hr, Average Speed : 0 km/hr

Q. Which of the following statement is correct for a round trip along the same route?

1. The average speed is zero.
2. The average velocity is zero.
3. The average velocity is half of the average speed.
4. Both the average velocity and average speed are non-zero.

Q.

Average Velocity and Average Speed is same for :

1. Both option A and C.

2. For a flight travelling between Delhi to Kolkata.

3. A car making a round trip on a circular track.

4. A single trip on a straight road.

Q. Which of the following statement is correct for a round trip along the same route?

1. The average speed is zero.
2. The average velocity is half of the average speed.
3. The average velocity is zero.
4. Both the average velocity and average speed are non-zero.

Q.

Choose the correct statement(s).

1. The average velocity of a moving body can be zero.

2. The average velocity of a moving body cannot be zero.

3. The average speed of a moving body can be zero.

4. The average speed of a moving body is always zero.

Q. The average velocity and the average speed would remain the same for:

1. A car travelling on a straight road
2. A girl swimming linearly in a pool.
3. A train travelling between two cities on a linear track
4. A toy train making a round trip on a circular track

Q. Choose the correct statement.

1. The average velocity of a moving body can be zero.
2. The average speed of a moving body is always less than the average velocity.
3. The average velocity of a moving body cannot be zero.
4. The average speed of a moving body can be zero.

Q.

Joseph jogs from one end A to the other end B of the straight 300 m road in 2 minutes 50 seconds and then turns around and jogs 100 m back to point C in another 1 minute. Joseph's average speeds and velocities in jogging, between points A and B, respectively, will be

1. $1.76m{s}^{-1},0.869m{s}^{-1}$
2. $0.869m{s}^{-1},0.869m{s}^{-1}$
3. $0.869m{s}^{-1},1.76m{s}^{-1}$
4. $1.76m{s}^{-1},1.76m{s}^{-1}$

Q. Speed is a vector quantity.

1. True
2. False