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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An object is moving with variable speed, then

(1) Its velocity may be zero

(2) Its velocity must be variable

(3) Its acceleration may be zero

(4) Its velocity must be constant

Subtopic:  Acceleration |
 75%
From NCERT
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The position of a particle moving along x-axis is given by x=10t-2t2. Then the time (t) at which it will momently come to rest is

1. 0

2. 2.5 s

3. 5 s

4. 10 s

Subtopic:  Instantaneous Speed & Instantaneous Velocity |
 87%
From NCERT
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