Instantaneous Speed

Q.

Difference between odometer and speedometer.

Q.

When is the instantaneous speed same as the average speed?

Q.

What does the odometer of an automobile measure?

Q. What does the slope of a displacement-time graph represent?

Q. A body is moving in a straight line and its displacement at various instants of time is given in the following table. Plot displacement-time graph and calculate the total distance travelled in interval $1$ s to $5$ s.

Time(s)	Displacement (m)
0	2
1	6
2	12
3	12
4	12
5	18
6	22
7	24

Q. A particle is moving along X axis so that its velocity varies with time as v=2t-8 .distance travelled by the particle in time interval 1 sec to 6 sec is

Q.

Speedometer displays the speed of a moving vehicle.

1. True
2. False

Q. A particle moving in a straight line covers half distance with speed of 3 m/s . The other half of distance with speed of two equal time intervals with speed 4.5m/s and 7.5m/s respectively. The average speed of tge particle during motion is

Q.

Write the formula for the distance travelled by a body in n seconds?

Q.

Under what condition the average velocity is equal to instantaneous velocity?

Q.

An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s.
What will be the velocity after 7 s from the start?

Q. under what condition the magnitude of average velocity is equally to the average speed?

Q. An object moves with uniform magnitude of acceleration. Then it can have

1. Variable speed and constant velocity
2. Constant speed and velocity
3. Variable velocity and constant speed
4. Zero instantaneous velocity and non-zero speed

Q. A particle is moving along a circular path of radius 5 m with a uniform speed of 5 m/s. What will be the average acceleration when the particle completes half revolution?

Q.

The journey of a car is described by the displacement time graph. Which is the correct information regarding it’s journey?

1. $V_{avg}$ = 0.5 m/s
2. Displacement = 10 m
3. Distance = 4 m
4. $V_{max}$ = 3.5 m/s

Q.

A particle is moving in $X-Yplane$, which crosses origin at $t=0$ with a velocity of $10{\mathrm{ms}}^{-1}$ along positive $X-axis$. A constant acceleration, whose $X$ and $Y$ components are $-2{\mathrm{ms}}^{-2}$ and $1{\mathrm{ms}}^{-2}$ respectively is acting on particle. Determine
(a) the time when velocity vector becomes parallel to $Y-axis$.
(b) the position of the particle in above situation.
(c) the time when the particle crosses $Y-axis$.
(d) the speed of the particle when it crosses $Y-axis$.

Q.

An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s.
What will be the velocity after 7 s from the start?

Q. An object move on straight line path so that velocity depends upon time as v=t-2) m /s find average speed and average velocity in 4sec.

Q.

A particle starts from origin with an initial velocity of $5{\mathrm{ms}}^{-1}$ along positive $Y-axis$, under a constant acceleration whose $X$ and $Y$ components are $2{\mathrm{ms}}^{-2}$ and $1{\mathrm{ms}}^{-2}$, respectively. Determine the velocity (magnitude and direction both) of the particle at $t=4\mathrm{s}$.

Q. An object follows a curved path. The following quantities may remain constant during the motion
(a) speed
(b) velocity
(c) acceleration
(d) magnitude of acceleration.

Q.

The speedometer of vehicles measures______.

1. average velocity

2. average speed

3. instantaneous Velocity

4. instantaneous speed

Q.

all buses and cars these days are fitted with a speedometer which shows the velocity of the vehicle. a device called odometer records the distance moved by the vehicle. if the reading on the odometer of the vehicle in the beginning of the trip and after 40 min were 1048km and 1096km respectively, calculate its average velocity. will the reading on the speedometer show this velocity when the vehicle is moving? support ur ans. with a reason.

Q.

Can a body have

a)zero average speed but non zero average velocity

b)negative acceleration and yet be speeding up

Q. In a distance - time graph, zero slope implies the object is at rest.

1. True
2. False

Q.

What is the rate of change of velocity called?

1. Acceleration

2. Speed

3. Displacement

4. Distance

Q.

A body has an initial velocity of $4m{s}^{-1}$ and deceleration of $4m{s}^{-2}$. What is the final velocity after travelling a distance of $2m$?

1. $\sqrt{3}2m{s}^{-1}$
2. $16m{s}^{-1}$
3. $4m{s}^{-1}$
4. $0m{s}^{-1}$

Q.

A body starts at a point and reaches the same point after time $t$. Which of the following represents its displacement time graph?

1. 

2. 

3. 

4. 

Q. A particle retards from a velocity u while moving in a straight line. If the magnitude of deacceleration is directly proportional to the square root of speed of particle, find its average velocity for total time of its motion.

Q.

What is the rate of change of velocity called?

1. Displacement

2. Acceleration

3. Speed

4. Distance

Q.

A body starts at a point and reaches the same point after time $t$. Which of the following represents its displacement time graph?

1. 

2. 

3. 

4.