Speed

Q.

Under what condition is the magnitude of the average velocity of an object equal to its average speed?

Q.

In a flight of $600km$, an aircraft was slowed down due to bad weather. Its average speed for the trip was reduced by $200km/hr$and the time of flight increased by $30$minutes. What is the duration of the flight?

Q.

A train travels 40 km at a uniform speed of $30km{h}^{-1}$. Its average speed for the whole journey after travelling another 40 km is $45km{h}^{-1}$. Its speed in the second half of the journey is ____.

1. $45km{h}^{-1}$

2. $90km{h}^{-1}$

3. $60km{h}^{-1}$

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

Q.

Average speed and the magnitude of average velocity are same only for a body traveling in a straight line without changing its direction.

1. True

2. False

Q.

What is the rate of change of motion?

Q.

What does the speedometer of a vehicle measure and why?

Q. Which among the following statement is false?

1. If speed is zero, then its velocity must also be zero.
2. If velocity is constant, then its speed must also be constant.
3. If speed is constant, then its velocity must also be constant.
4. If average velocity is zero, then its average speed need not be zero.

Q.

Alex travels from his house to his friend's house with speed $V_1$ and returns to his house with speed $V_2$. The distance between the houses is $X$. What is the average speed of the Alex?

1. $\frac{2V_1+V_2}{V_1+V_2}$

2. $\frac{V_1+2V_2}{V_1{V}_2}$

3. $\frac{2V_1{V}_2}{V_1+V_2}$

4. $\frac{2V_1{V}_2}{V_1+2V_2}$

Q.

In order to cover a certain distance in a shorter time span, the object should have a greater _________.

1. speed

2. mass

3. time period

4. frequency

Q. Calculate the distance travelled by the object at a speed of 15 $m{s}^{-1}$ for $2$ seconds.

1. $30m$
2. $15m$
3. $7.5m$
4. $60m$

Q. A car travels $30km$ at a uniform speed of $40km/h$ and the next $30km$ at a uniform speed of $20km/h$. Find its average speed.

Q. The time period of a simple pendulum is affected by the mass of its bob.

1. False
2. True

Q. Observe the below graph & calculate:
(a) Average speed of the car in m/s.
(b) Total distance travelled between $5^{th}$ minute and ${45}^{th}$ minute.

Q. The speed of a body is $5m{s}^{-1}$. The time it would take to cover a distance of 6 $km$ is ___ .

1. $\frac{1}{3}$ hour
2. $\frac{2}{3}$ hour
3. 1 hour
4. $\frac{1}{5}$ hour

Q.

The S.I. unit of speed is _______.

1. speed

2. acceleration

3. retardation

4. force

Q. Change the speed of $6m/s$ into $km/h$.

Q. The time period of a simple pendulum is affected by the mass of its bob.

1. False
2. True

Q. Which parameter would not affect the time period of the simple pendulum?

1. d
2. g
3. L
4. m

Q. How far does the space shuttle travel in the first 8 minutes?

1. $8,000m$
2. $3733km$
3. $2,016km$
4. $2,600km$

Q. Which parameter would not affect the time period of the simple pendulum?

1. m
2. g
3. L
4. d

Q. Which quantity indicates that a body is moving faster as compared to another body?

1. Mass
2. Speed
3. Volume
4. Weight

Q. An insect moves along the sides of a wall of dimension $12\text{m}\times 5\text{m}$, starting from one corner and reaches the diagonally opposite corner. If the insect takes $10\text{s}$ for its motion, then find the ratio of the average speed to the average velocity of the insect.

1. $17:12$
2. $13:5$
3. $13:17$
4. $17:13$

Q. Prasanth rides his bicycle with a speed of 4 m/s. How far can he travel in 2 seconds?​

1. 2 m
2. 4 m
3. 6 m
4. 8 m