A person travels along a straight road for the first t3 time with a speed v1 and for next 2t3 time with a speed v2. Then the mean speed v is given by

(1) v=v1+2v23

(2) 1v=13v1+23v2

(3) v=132v1v2

(4) v=3v22v1

Subtopic:  Average Speed & Average Velocity |
 76%
From NCERT
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The figure shows the graph of the x-coordinate of a particle moving along the x-axis as a function of time. Average velocity during t=0 to 6 s and instantaneous velocity at t=3 s respectively, will be:

 

1. 10 m/s, 0
2. 60 m/s, 0
3. 0, 0
4. 0, 10 m/s

Subtopic:  Graphs |
 54%
From NCERT
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Position-time graph for a particle is shown in the figure. Starting from t=0, at what time t, the average velocity is zero?

(1) 1 s

(2) 3 s

(3) 6 s

(4) 7 s

Subtopic:  Graphs |
 60%
From NCERT
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A body in one-dimensional motion has zero speed at an instant. At that instant, it must have:

1. zero velocity. 2. zero acceleration.
3. non-zero velocity. 4. non-zero acceleration.
Subtopic:  Instantaneous Speed & Instantaneous Velocity |
 72%
From NCERT
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If a particle is moving along a straight line with increasing speed, then:

1. its acceleration is negative.
2. its acceleration may be decreasing.
3. its acceleration is positive.
4. both (2) & (3)

Subtopic:  Acceleration |
 59%
From NCERT
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At any instant, the velocity and acceleration of a particle moving along a straight line are v and a. The speed of the particle is increasing if

(1) v>0, a>0

(2) v<0, a>0

(3) v>0, a<0

(4) v>0, a=0

Subtopic:  Acceleration |
 82%
From NCERT
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If the magnitude of average speed and average velocity over a time interval are the same, then

(1) The particle must move with zero acceleration

(2) The particle must move with non-zero acceleration

(3) The particle must be at rest

(4) The particle must move in a straight line without turning back

Subtopic:  Average Speed & Average Velocity |
 79%
From NCERT
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If v is the velocity of a body moving along x-axis, then acceleration of body is

(1) dvdx

(2) vdvdx

(3) xdudx

(4) vdxdv

Subtopic:  Acceleration |
 87%
From NCERT
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If a body is moving with constant speed, then its acceleration

(1) Must be zero

(2) May be variable

(3) May be uniform

(4) Both (2) & (3)

Subtopic:  Acceleration |
From NCERT
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When the velocity of a body is variable, then:

1. its speed may be constant.

2. its acceleration may be constant.

3. its average acceleration may be constant.

4. All of the above

Subtopic:  Acceleration |
 70%
From NCERT
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