Speed

Q. A $100m$ long train moving on a straight level track passes a pole in $5s$. Find the speed of the train and the time it will take to cross a $100m$ long bridge.

1. $13m{s}^{-1}$ and $40s$
2. $25m{s}^{-1}$ and $30s$
3. $15m{s}^{-1}$ and $65s$
4. $20m{s}^{-1}$ and $10s$

Q. A boy travels with an average speed of $10m{s}^{-1}$ for $20min$. How much distance does he travel?​

Q. From 09:00 pm to 10:00 pm, a person drove at a speed of 40 km/h, then he took a halt for an hour. He resumed his journey at 11:00 pm and drove till 12:00 am midnight at a speed of 50 km/h. What is his average speed in the time interval between 09:00 pm and 12:00 am?

1. 90 km/h
2. 40 km/h
3. 30 km/h
4. 45 km/h

Q. Question 10
An artificial satellite is moving in a circular orbit of radius 42250 km. Calculate its speed if it takes 24 hours to revolve around the earth.

Q. The bob of a simple pendulum takes 2 seconds to go from one extreme position to the mean position. What is the time period of the simple pendulum?

1. 2 s
2. 4 s
3. 6 s
4. 8 s

Q.

Question 11
Avinash can run with a speed of $8m{s}^{-1}$ against the frictional force of $10N$, and Kapil can move with a speed of $3m{s}^{-1}$ against the frictional force of $25N$. Who is more powerful and why?

Q. A train travels a distance of $300km$ with an average speed of $60km{h}^{-1}$. How much time does it take to cover the distance?​

Q. A satellite is moving in a circular orbit of radius 4200 km around the earth. What is its speed if it takes one day to complete one revolution?

1. $4200km{h}^{-1}$
2. $1100km{h}^{-1}$
3. $3100km{h}^{-1}$
4. $2200km{h}^{-1}$

Q.

Define speed. Explain how distance is related to time using the formula

Q. A car covers a distance of $160\text{km}$ between two cities in $4\text{h}$. What is the average speed of the car?

Q. A car travels with a speed 12 m/s, while a scooter travels with a speed 36 kmph. Which of the two travels faster?

Q. the speed of a car was 50 km/hr for the first 900 sec then 40km/hr for the next 50km and then the car decelerated uniformly at 10km/hr sq till it comes to rest. average speed of the car was?

Q. A car moves with a speed of 50 km/h for 2 hours and then with a speed of 60 km/h for the next 3 hours. The total distance covered by the car is __________.

1. $280km$
2. $100km$
3. $80km$
4. $180km$

Q.

A car moves a circular path of radius $20\mathrm{m}$ in $50\mathrm{s}$ with a uniform speed find the speed

Q. A car travels with speed $30km{h}^{-1}$ for $30$ minute and then with speed $40km{h}^{-1}$ for one hour. Find :
(a) the total distance travelled by the car
(b) the total time of travel, and
(c) the average speed of car.

Q.

Give the relation between speed and time, if the distance to be traveled is same.

1. As speed increases, the time taken will also increase.

2. There will be simultaneous changes in speed and time, not predictable.

3. As speed decreases, the time taken will also decrease.

4. As speed increases, the time taken will decrease.

Q. Figure shows an oscillating pendulum.

Time taken by the bob to move from A to C is $t_1$ and from C to O is $t_2$. The time period of this simple pendulum is

1. $(t_1+t_2)$
2. $2(t_1+t_2)$
3. $3(t_1+t_2)$
4. $4(t_1+t_2)$

Q. Convert $36km/h$ to SI unit.

1. $5m/s$
2. $10m/s$
3. $15m/s$
4. $20m/s$

Q. What is the unit of time period of a simple pendulum?

1. metre
2. second
3. kilometre
4. kilogram

Q. A train $100\text{m}$ long is moving at a speed of $90\text{kmph}$. How long will it take to cross two poles that are $150\text{m}$ apart?

1. $10\text{min}$
2. $10\text{s}$
3. $4\text{s}$
4. $4\text{min}$

Q.

We can find the speed of a moving object if we know the mass and the distance traveled by it.

1. True
2. False

Q.

Write true or false :
The speed $5m{s}^{-1}$ is less than $25km{h}^{-1}$.

Q.

A car takes $4hours$ to travel from Bangalore to Chennai, whereas a flight takes only $30minutes$ to travel from Bangalore to Chennai. If the distance from Bangalore to Chennai by road is $400km$ and by air is $150km$, find the average speed of flight and the average speed of car respectively.

1. $300km{h}^{-1},37.5km{h}^{-1}$
2. $300km{h}^{-1},120km{h}^{-1}$
3. $300km{h}^{-1},200km{h}^{-1}$
4. $300km{h}^{-1},100km{h}^{-1}$

Q. A body moves at a speed of $20km{h}^{-1}$ for the first $2$ hours. After that, it moves at the speed of $30km{h}^{-1}$ for the next 1 hour. What is the total distance travelled by the body?

1. $60km$
2. $70km$
3. $80km$
4. $90km$

Q. Which of the following is the fastest speed among the following?

1. 20 m/s
   
2. 20 km/min
   
3. 2.5 km/s
   
4. 3600 m/min

Q. A boy goes from his house to school by bus at a speed of $20km{h}^{-1}$ and returns back through the same route at a speed of $30km{h}^{-1}$. The average speed of his journey is

1. $24km{h}^{-1}$
2. $25km{h}^{-1}$
3. $20km{h}^{-1}$
4. $30km{h}^{-1}$

Q. Which of the following relation is correct?

1. $Dis\tan ce=\frac{Time}{Speed}$
2. $Speed=Dis\tan ce\times Time$
3. $Time=\frac{Dis\tan ce}{Speed}$
4. $Dis\tan ce=\frac{Speed}{Time}$

Q. A cyclist travels a distance of 1 km in the first hour, 0.5 km in the second hour and 0.3 km in the third hour. Find the average speed of the cyclist in​
(i)$km{h}^{-1}$​
(ii) $m{s}^{-1}$. ​

Q. Two points A and B are situated 60 km apart on a straight road. A vehicle travels from A to B in 3 h. It then halts for 1 h and takes 2 h to come back from B to A. Find the average speed of the whole journey.

1. 10 km/h
2. 20 km/h
3. 25 km/h
4. 24 km/h

Q. A racing car moving at a speed of $120km{h}^{-1}$ finishes the race in 4 minutes. The car registered second place, while the winner had finished 2 minutes before. What is the speed of the winning car?

1. $240km{h}^{-1}$
2. $200km{h}^{-1}$
3. $160km{h}^{-1}$
4. $300km{h}^{-1}$