Given below are two statements:  Assertion (A): Position-time graph of a stationary object is a straight line parallel to the time axis. Reason (R): For a stationary object, the position does not change with time.    1. Both (A) and (R) are True and (R) is the correct explanation of (A). 2. Both (A) and (R) are True but (R) is not the correct explanation of (A). 3. (A) is True but (R) is False. 4. Both (A) and (R) are False.

Subtopic:  Distance & Displacement |
88%
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The acceleration of a particle starting from rest varies with time according to the relation A = – aω2sinωt. The displacement of this particle at a time t will be:

1. $-\frac{1}{2}\left({\mathrm{a\omega }}^{2}\mathrm{sin\omega t}\right){\mathrm{t}}^{2}$

2. $\mathrm{a\omega sin\omega t}$

3. $\mathrm{a\omega cos\omega t}$

4. $\mathrm{asin\omega t}$

Subtopic:  Non Uniform Acceleration |
59%
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Four marbles are dropped from the top of a tower one after the other at a one-second interval. The first one reaches the ground after 4 seconds. When the first one reaches the ground the distances between the first and second, the second and third, and the third and fourth will be, respectively:

 1 35 m, 25 m, and 15 m 2 30 m, 20 m, and 10 m 3 20 m, 10 m, and 5 m 4 40 m, 30 m, and 20 m
Subtopic:  Uniformly Accelerated Motion |
72%
From NCERT
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A particle is projected upwards. The times corresponding to height h while ascending and while descending are t1 and t2 respectively. The velocity of projection will be:

1. gt1

2. gt2

3. $g$ $\left({t}_{1}+{t}_{2}\right)$

4. $\frac{g\left({t}_{1}+{t}_{2}\right)}{2}$

Subtopic:  Uniformly Accelerated Motion |
69%
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Acceleration-time graph of a body is shown.

The corresponding velocity-time graph of the same body is:

 1 2 3 4
Subtopic:  Graphs |
64%
From NCERT
PMT - 2004
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Which of the following velocity-time graphs shows a realistic situation for a body in motion?

 1 2 3 4

Subtopic:  Graphs |
87%
From NCERT
AIIMS - 2004
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Which graph represents a uniformly accelerated motion?

 1 2 3 4
Subtopic:  Graphs |
66%
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In the following graph, the distance travelled by the body in metres is:

 1 $$200$$ 2 $$250$$ 3 $$300$$ 4 $$400$$
Subtopic:  Graphs |
86%
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The velocity-time graph of a body moving in a straight line is shown in the figure. The displacement and distance travelled by the body in 6 seconds are, respectively, :

1. 8 m, 16 m

2. 16 m, 8 m

3. 16 m, 16 m

4. 8 m, 8 m

Subtopic:  Graphs |
78%
From NCERT
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A lift is going up. The variation in the speed of the lift is as given in the graph. What is the height to which the lift takes the passengers?

 1 3.6 m 2 28.8 m 3 36.0 m 4 Cannot be calculated from the above graph
Subtopic:  Graphs |
68%
From NCERT
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