The displacement time graph of a moving particle is shown in the figure below. The instantaneous velocity of the particle is negative at the point:

     

1. D 2. F
3. C 4. E

Subtopic:  Graphs |
 86%
From NCERT
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A particle moves along a path \(ABCD\) as shown in the figure. The magnitude of the displacement of the particle from \(A\) to \(D\) is:

       

1. (5+102)m
2. \(10\) m
3. 152 m
4. \(15\) m

Subtopic:  Distance & Displacement |
 70%
From NCERT
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Which of the following four statements is false?

1. A body can have zero velocity and still be accelerated.
2. A body can have a constant velocity and still have a varying speed.
3. A body can have a constant speed and still have a varying velocity.
4. The direction of the velocity of a body can change when its acceleration is constant.

Subtopic:  Instantaneous Speed & Instantaneous Velocity |
 66%
From NCERT
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Two cars \(A\) and \(B\) are travelling in the same direction with velocities \(v_1\) and \(v_2\) \((v_1>v_2).\) When the car \(A\) is at a distance \(d\) behind car \(B\), the driver of the car \(A\) applied the brake producing uniform retardation \(a\). There will be no collision when:
1. \(d < \frac{\left( v_{1} - v_{2} \right)^{2}}{2 a}\)
2. \(d < \frac{v_{1}^{2} - v_{2}^{2}}{2 a}\)
3. \(d > \frac{\left(v_{1} - v_{2}\right)^{2}}{2 a}\)
4. \(d > \frac{v_{1}^{2} - v_{2}^{2}}{2 a}\)

Subtopic:  Relative Motion in One Dimension |
 59%
From NCERT
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A particle moves a distance \(x\) in time \(t\) according to equation \(x = (t+5)^{-1}\). The acceleration of the particle is proportional to: 

1. \((\text{velocity})^{\frac{3}{2}}\) 2. \((\text{distance})^2\)
3. \((\text{distance})^{-2}\) 4. \((\text{velocity})^{\frac{2}{3}}\)
Subtopic:  Acceleration |
 66%
From NCERT
NEET - 2010
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The position \(x\) of a particle moving along the \(x\)-axis varies with time \(t\) as \(x=20t-5t^2,\)
where \(x\) is in meters and \(t\) is in seconds. The particle reverses its direction of motion at:

1. \(x=40~\text{m}\)
2. \(x=10~\text{m}\)
3. \(x=20~\text{m}\)
4. \(x=30~\text{m}\)

Subtopic:  Instantaneous Speed & Instantaneous Velocity |
 81%
From NCERT
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A car moves from \(X\) to \(Y\) with a uniform speed \(v_u\) and returns to \(X\) with a uniform speed \(v_d.\) The average speed for this round trip is:

1. \(\frac{2 v_{d} v_{u}}{v_{d} + v_{u}}\) 2. \(\sqrt{v_{u} v_{d}}\)
3. \(\frac{v_{d} v_{u}}{v_{d} + v_{u}}\) 4. \(\frac{v_{u} + v_{d}}{2}\)
Subtopic:  Average Speed & Average Velocity |
 82%
From NCERT
AIPMT - 2007
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A particle of unit mass undergoes one-dimensional motion such that its velocity varies according to \(v(x)= βx^{- 2 n}\) where \(\beta\) and \(n\) are constants and \(x\) is the position of the particle. The acceleration of the particle as a function of \(x\) is given by:
1. \(- 2 nβ^{2} x^{- 2 n - 1}\)
2. \(- 2 nβ^{2} x^{- 4 n - 1}\)
3. \(- 2 \beta^{2} x^{- 2 n + 1}\)
4. \(- 2 nβ^{2} x^{- 4 n + 1}\)

Subtopic:  Non Uniform Acceleration |
 68%
From NCERT
NEET - 2015
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If the velocity of a particle is \(v=At+Bt^{2},\) where \(A\) and \(B\) are constants, then the distance travelled by it between \(1~\text{s}\) and \(2~\text{s}\) is:

1. \(3A+7B\) 2. \(\frac{3}{2}A+\frac{7}{3}B\)
3. \(\frac{A}{2}+\frac{B}{3}\) 4. \(\frac{3A}{2}+4B\)
Subtopic:  Instantaneous Speed & Instantaneous Velocity |
 88%
From NCERT
NEET - 2016
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A particle moves along a straight line and its position as a function of time is given by \(x= t^3-3t^2+3t+3\) then particle:

1. stops at \(t=1~\text{s}\) and reverses its direction of motion.
2. stops at \(t= 1~\text{s}\) and continues further without a change of direction.
3. stops at \(t=2~\text{s}\) and reverses its direction of motion.
4. stops at \(t=2~\text{s}\) and continues further without a change of direction.
Subtopic:  Instantaneous Speed & Instantaneous Velocity |
 51%
From NCERT
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