A body starting from rest moves with constant acceleration. The ratio of distance covered by the body during the 5th sec to that covered in 5 sec is 

(1) 9/25

(2) 3/5

(3) 25/9

(4) 1/25

Subtopic:  Uniformly Accelerated Motion |
 85%
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Two trains, each 50 m long, are travelling in the opposite direction with velocities 10 m/s and 15 m/s. The time of crossing is:

1. 10 sec

2. 4 sec

3. 23 sec

4. 43 sec

Subtopic:  Relative Motion in One Dimension |
 78%
From NCERT
PMT - 1999
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A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time  

1.  4 s
2.  36 s
3.  38 s
4.  5 s

Subtopic:  Relative Motion in One Dimension |
 87%
From NCERT
PMT - 1996
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A 210-meter long train is moving due north at a speed of 25 m/s. A small bird is flying due South a little above the train with a speed of 5m/s. The time taken by the bird to cross the train is 

(1) 6 s

(2) 7 s

(3) 9 s

(4) 10 s

Subtopic:  Relative Motion in One Dimension |
 89%
From NCERT
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A police jeep is chasing with a velocity of 45 km/h a thief in another jeep moving with a velocity of 153 km/h. Police fire a bullet with a muzzle velocity of 180 m/s. The velocity with which it will strike the car of the thief is 

1.  150 m/s
2.  27 m/s
3.  450 m/s
4.  250 m/s

Subtopic:  Relative Motion in One Dimension |
 67%
From NCERT
PMT - 2004
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A train of 150 meter length is going towards north direction at a speed of 10 m/sec. A parrot flies at the speed of 5 m/sec towards south direction parallel to the railway track. The time taken by the parrot to cross the train is 

(1) 12 sec

(2) 8 sec

(3) 15 sec

(4) 10 sec

 

Subtopic:  Relative Motion in One Dimension |
 89%
From NCERT
PMT - 1992
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The distance between two particles is decreasing at the rate of 6 m/sec when they are moving in the opposite directions. If these particles travel with the same initial speeds and in the same direction, then the separation increases at the rate of 4 m/sec. It can be concluded that particles' speeds could be

1. 5 m/sec, 1 m/sec

2. 4 m/sec, 1 m/sec

3. 4 m/sec, 2 m/sec

4. 5 m/sec, 2 m/sec

Subtopic:  Relative Motion in One Dimension |
 75%
From NCERT
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An express train is moving with a velocity v1. Its driver finds another train is moving on the same track in the same direction with velocity v2. To escape collision, driver applies a retardation 'a' on the train. The minimum time of escaping collision will be 

1.  t=v1v2a
2.  t1=v12v222
3.  None
4.  Both

Subtopic:  Relative Motion in One Dimension |
 70%
From NCERT
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A stone falls from a balloon that is descending at a uniform rate of 12 m/s. The displacement of the stone from the point of release after 10 sec is

(1) 490 m

(2) 510 m

(3) 610 m

(4) 725 m

Subtopic:  Uniformly Accelerated Motion |
 72%
From NCERT
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A ball is dropped on the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, the average acceleration during contact is 

1. 2100 m/sec2 downwards

2. 2100 m/sec2 upwards

3. 1400 m/sec2

4. 700 m/sec2

Subtopic:  Acceleration |
 51%
From NCERT
PMT - 1997
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