Average Speed

Q.

What is the time taken by the light to travel from the Sun to the Earth?

1. 8 minutes

2. 10 minutes

3. 15 minutes

4. 3 minutes

Q.

What is the S.I. unit of speed?

1. km

2. km/s

3. km/h

4. m/s

Q.

What are the speedometer and odometer?

Q.

What is speed

Q.

Please explain why we multiply with 18/5 to convert m/s into km/h

Q. A body travel 200cm in the first 2s and 220cm in 5s. Calculate the velocity at the end of the seventh second from start

Q.

_______ is the SI unit of speed.

Q.

How do you determine the speed of a moving vehicle?

Q.

A car moves at a speed of $54km/hr$. What is the speed of the car in metres per second?

Q. If the speed of a car is $5m{s}^{-1}$, what is the speed in $km{h}^{-1}$?

1. 18

Q. Odometer measures

Q. A truck moves a distance of 50 km. It covers first half of the distance at speed of 200m/s and second half at speed v. if average speed of truck is 100 m/s then what is the value of v?

Q. a) Renna walks a distance of 2 km in 40 minutes. Find her speed.
b) If the girl walks back and covers the same distance in 50 minutes. What is the average speed of the girl? [2 MARKS]

Q.

What is an Odometer and where is it commonly found? [2 MARK]

Q.

Why thunder is heard a few seconds after the flash is seen?

Q. A car travels 36 km in 2 hours. Its average speed is:

1. 18 m/s
2. 36 m/s
3. 5 m/s
4. None of these

Q. The speed of the vehicle is measured using a/an ________and the distance travelled can be measured using a/an_________.

1. odometer, speedometer
2. speedometer, galvanometer
3. speedometer, odometer
4. galvanometer, odometer

Q.

How can speed be calculated?

Q.

How long a train will take to travel a distance of 200 km with a speed of 60 kmh-1

Q.

The odometer of a vehicle has an initial reading of 22256 km. After the trip, it shows a reading of 22356 km. If the time taken for the trip is 5 hours, find the average speed of the vehicle.

1. 20 km/h

2. 30 km/h

3. 40 km/h

4. 50 km/h

Q.

A man swims a length of 100 m in still water with a speed of 1.2 m/s and returns the same length with a speed of 0.8 m/s. What is the average swimming speed of a man? What is his net velocity?

Q.

When the speed remains constant, the distance travelled is _____ proportional to the time.

Q.

Explain derived quantity.

Q.

The S.I unit of speed is

1. $cm{s}^{-1}$

2. $m{s}^{-1}$

3. $km{h}^{-1}$

4. $newton$

Q. A boy walks 10 km in 20 minutes. What is his speed in kmph?

1. 20 kmph
2. 30 kmph
3. 40 kmph
4. 10 kmph

Q.

If the speed of a body is $5m{s}^{-1}$, then the time it would take to cover a distance of 6 km is:

1. 1/3 hour

2. 2/3 hour

3. 1/5 hour

4. 1 hour

Q.

If a train covers 50 km in 2 hours, how much time would it take to cover 100 km?

1. 4 hours

2. 8 hours

3. 6 hours

4. 2 hours

Q.

Express the following speed in $m/s$ (metres per second):

$12.6km/hr$

Q. If a car covers 70 km in the first hour and 100 km in the second hour. Then what is the average speed of the car for the entire journey?

1. 56 km/h
2. 85 km/h
3. 93 km/h
4. 72 km/h

Q.

Distinguish between speed and velocity. State their CGS and SI units.