A ball is thrown upward with a certain speed. It passes through the same point at 3 second and 7 second from the start. The maximum height achieved by the ball is:

1.  500 m

2.  250 m

3.  125 m

4.  450 m

Subtopic:  Uniformly Accelerated Motion |
 61%
From NCERT
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For the following acceleration versus time graph the corresponding velocity versus displacement graph is 

1. 

2. 

3. 

4. 

Subtopic:  Uniformly Accelerated Motion |
From NCERT
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A body thrown vertically so as to reach its maximum height in t second. The total time from the time of projection to reach a point at half of its maximum height while returning (in second) is:

1. 2t

2. 1+12t

3. 3t2

4. t2

Subtopic:  Uniformly Accelerated Motion |
 58%
From NCERT
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A stone falls freely from rest from a height h and it travels a distance 9h25 in the last second. The value of h is:

1. 145 m

2. 100 m

3. 125 m

4. 200 ms

Subtopic:  Uniformly Accelerated Motion |
 69%
From NCERT
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The initial velocity of a particle is u (at t = 0) and the acceleration f is given by at. Which of the following relation is valid 

1. v=u+at2

2. v=u+at22

3. v=u+at

4. v = u

Subtopic:  Non Uniform Acceleration |
From NCERT
PMT - 1981
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The velocity of a body depends on time according to the equation v=20+0.1t2. The body is undergoing 

1. Uniform acceleration

2. Uniform retardation

3. Non-uniform acceleration

4. Zero acceleration

Subtopic:  Non Uniform Acceleration |
 66%
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:  Average Speed & Average Velocity |
 60%
From NCERT
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Two cars A and B are travelling in the same direction with velocities v1 and v2 (v1>v2). 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<(v1v2)22a

2. d<v12v222a

3. d>(v1v2)22a

4. d>v12v222a 

Subtopic:  Relative Motion in One Dimension |
 55%
From NCERT
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The displacement of a particle is given by y=a+bt+ct2dt4. The initial velocity and acceleration are, respectively:

1. \(\mathrm{b}, ~\mathrm{-4d}\) 2. \(\mathrm{-b},~ \mathrm{2c}\)
3. \(\mathrm{b}, ~\mathrm{2c}\) 4. \(\mathrm{2c}, ~\mathrm{-2d}\)
Subtopic:  Non Uniform Acceleration |
 81%
From NCERT
PMT - 1999
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Two trains travelling on the same track are approaching each other with equal speeds of 40 m/s. The drivers of the trains begin to decelerate simultaneously when they are just 2.0 km apart. Assuming the decelerations to be uniform and equal, the value of the deceleration to barely avoid collision should be 

1. 11.8 m/s2

2. 11.0 m/s2

3. 1.6 m/s2

4. 0.8 m/s2

Subtopic:  Uniformly Accelerated Motion |
From NCERT
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