Average Speed

Q.

The object travels 16m in 4s and then another 16m in 2s. What is the average speed of the object?

Q.

On a 120 km long track, a train travels the first 30 km with a uniform speed of 30 km/h. How fast must the train travel for the rest part of the journey so as to average 60 km/h for the entire trip?

1. 90 km/h

2. 80 km/h

3. 70 km/h

4. 60 km/h

Q.

A car travels first 30 km with a uniform speed of 60 km $h^{-1}$ and then next 30 km with a uniform speed of 40 km $h^{-1}$. Calculate:

(i) the total time of journey,
(ii) the average speed of the car.

Q.

The average speed of an object over a given time duration is 6m/s. If it travels first half of the duration with a constant speed 4m/s , it's speed during the next half duration is what?

Q.

A car travels 40 kilometers at an average speed of 80 km/h and then travels 40 kilometers at an average speed of 40 km/h. What is the average speed of the car for this 80 km trip?(1)40km/h

(2)45km/h

(3)48km/h

(4)53km/h

Q.

A student while going to school on a school bus, observes the average speed of the bus to be 20 km/h. On his return trip along the same way, average speed is 30 km/h. What is the average speed of the bus during the entire journey?

Q.

A car runs at a constant speed on a circular track of radius $100m$, taking $62.8seconds$ for every circular lap. The average velocity and average speed for each circular lap respectively is:

1. $0,0$

2. $0,10m/s$

3. $10m/s,10m/s$

4. $10m/s,0$

Q.

Speed may be negative, positive, or zero.

1. True
2. False

Q. A car traveled a distance of $100km$ in $2hours$. Find the average speed of the car.

1. $50km{h}^{-1}$

2. $10km{h}^{-1}$

3. $20km{h}^{-1}$

4. $30km{h}^{-1}$

Q.

What is the speed of a 150 m long train crossing a bridge of length 250 m in 25 seconds?

1. 15 m/s

2. 16 m/s

3. 17 m/s

4. 14 m/s

Q.

Abdul while driving to school computes his average speed to be 20 km/hr . on his return trip there is less traffic and his average speed is 30 km/hr . find the average speed of Abdul's trip.

Q.

a car cover 30 km at a uniform speed of 30km/hr. what should be its speed for the next 90km/hr if the average speed for the entire journey is 60km/h?

Q. 6.Two cars A and B race each other. The Car A ran for 4 min at a speed of 25 km/h, slept for 54 min and again ran for 2 min at a speed of 7.5km/h. Find the average speed of the car A in the race.Immersive Reader (2 Points)

Q.

It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw a lightning. He started his stopwatch. He found that after 22 seconds of lightning it's thunder was heard. Calculate the height of the clouds which caused this lightning. Given,
Speed of light $=3\times {10}^8$ $\frac{m}{s}$ and Speed of Sound $=340\frac{m}{s}$.

1. 5km

2. 10km

3. 7.5km

4. 8.5km

Q. An insect moves along a circular path of radius 10 cm with a constant speed. If it takes 1 minute to move from a point on the path to the diametrically opposite point, then the distance covered, speed, displacement and velocity respectively are

1. 31.4 cm, 31.4 cm/min, 20 cm, 20 cm/min
2. 3.14 cm, 3.14 cm/min, 10 cm, 10 cm/min
3. 0.314 cm, 0.314 cm/min, 1 cm, 1 cm/min
4. 314 cm, 314 cm/min, 0.1 cm, 0.1 cm/min

Q.

An engine supplies a constant power ‘p’ to an automobile of mass m starting from rest. At an instant of time t

1. $v\propto t^{\frac{1}{2}}$

2. $v\propto t^{\frac{3}{2}}$

3. $s\propto t^{\frac{3}{2}}$

4. both A and B

Q.

A truck running along a straight line increases its speed uniformly from 30 m/s to 60 m/s over a time interval 1 min. The distance travelled during this time interval is :

1. 900 m

2. 1800 m

3. 2700 m

4. 3600m

Q. Question 16
A motorcyclist drives from A to B with a uniform speed of $30kmph$ and returns back with a speed of $20kmph$ . Find its average speed.

Q. A motorcyclist drives from point A to point B with a uniform speed of $30km$ $h^{-1}$ and returns back to point A with a uniform speed of $20km$ $h^{-1}$. Find the average speed of the motorcyclist.

1. $5km{h}^{-1}$
2. $50km{h}^{-1}$
3. $24km{h}^{-1}$
4. $25km{h}^{-1}$

Q. A car travels from A to B at a, speed of $20km{h}^{-1}$ and returns at a speed of $30km{h}^{-1}$. The average speed of the car for the whole journey is:

1. $5km{h}^{-1}$
2. $24km{h}^{-1}$
3. $25km{h}^{-1}$
4. $50km{h}^{-1}$

Q. Find the average speed if a bus if it moves from point A to B at a speed of 30kmph amd returns at a speed of 50kmph.

Pls answer urgently
Regards CJ

Q.

1m/sec = ____ km/h

1. 50/3

2. 5/18

3. 3/50

4. 18/5

Q.

I went to a shop with constant speed of 30m/s and came back with 20m/s what is my average speed of travel?

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 toy train making a round trip on a circular track
3. A car travelling on a straight road
4. A girl swimming linearly in a pool.

Q.

A $60m$ 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 $540m$ long bridge.

1. 13 m/s, 40 s

2. 25 m/s, 30s

3. 12 m/s, 50s

4. 15 m/s, 65 s

Q. A 0.5 kg ball free fall from a height of $h_1$ = 7.2 m and reflected a height of $h_2$ = 3.2 m. Acceleration due to gravity = 10 $m/s^2$. Determine impulse.

Q. ntA boy runs for 10 mins at a uniform speed of 9 km/h. At what speed should he run for the next 20 mins so that the average speed comes to 12 km/h?n

Q. Question 16
A motorcyclist drives from A to B with a uniform speed of $30kmph$ and returns back with a speed of $20kmph$ . Find its average speed.

Q.

It was a rainy day in Bangalore. Rohit was sitting beside the window when he saw lightning strike. He started his stop watch. After 22 seconds, he heard thunder. Calculate the height of the clouds which caused the lightning. Given,
Speed of light = 3 x ${10}^8$ $\frac{m}{s}$ and Speed of sound = $340\frac{m}{s}$.

1. 8.5km

2. 7.5km

3. 5km

4. 10km

Q.

The distance between Delhi and Agra is 200km.A train travels the first 100km at a speed of 50km/h.How fast must the train travel the next 100km, so as average 70km/h for whole journey