A packet is dropped from a balloon which is going upwards with the velocity 12 m/s, the velocity of the packet after 2 seconds will be 

(1) –12 m/s

(2) 12 m/s

(3) –7.6 m/s

(4) 7.6 m/s

Subtopic:  Uniformly Accelerated Motion |
 69%
From NCERT
PMT - 2004
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If a freely falling body travels in the last second a distance equal to the distance travelled by it in the first three seconds, the time of the travel is:

1. 6 sec

2. 5 sec

3. 4 sec

4. 3 sec

Subtopic:  Uniformly Accelerated Motion |
 67%
From NCERT
PMT - 2004
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The effective acceleration of a body, when thrown upwards with acceleration a will be: 

1. ag2

2. a2+g2

3. (ag)

4. (a+g)

Subtopic:  Uniformly Accelerated Motion |
 60%
From NCERT
PMT - 2004
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A body is thrown vertically upwards with velocity u. The distance travelled by it in the fifth and the sixth seconds are equal. The velocity u is given by (g = 9.8 m/s2

(1) 24.5 m/s

(2) 49.0 m/s

(3) 73.5 m/s

(4) 98.0 m/s

Subtopic:  Uniformly Accelerated Motion |
 73%
From NCERT
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A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerates at 2 m/s2. He reaches the ground with a speed of 3 m/s. At what height, did he bail out ?

(1) 293 m

(2) 111 m

(3) 91 m

(4) 182 m

Subtopic:  Uniformly Accelerated Motion |
 56%
From NCERT
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When a ball is thrown up vertically with velocity v0, it reaches a maximum height of 'h'. If one wishes to triple the maximum height then the ball should be thrown with velocity

1. 3vo

2. 3v0

3. 9v0

4. (3/2)v0

Subtopic:  Uniformly Accelerated Motion |
 77%
From NCERT
AIIMS - 2005
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A particle moving in a straight line covers half the distance with speed of 3 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s respectively. The average speed of the particle during this motion is:  

1. 4.0 m/s

2. 5.0 m/s

3. 5.5 m/s

4. 4.8 m/s

Subtopic:  Average Speed & Average Velocity |
 69%
From NCERT
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The acceleration of a particle is increasing linearly with time t as bt. The particle starts from the origin with an initial velocity of v0. The distance travelled by the particle in time t will be:

(1) v0t+13bt2

(2) v0t+13bt3

(3) v0t+16bt3

(4) v0t+12bt2

Subtopic:  Non Uniform Acceleration |
 63%
From NCERT
PMT - 1995
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A particle starts from rest. Its acceleration (a) versus time (t) is as shown in the figure. The maximum speed of the particle will be: 

1. 110 m/s

2. 55 m/s

3. 550 m/s

4. 660 m/s 

Subtopic:  Graphs |
 72%
From NCERT
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A car accelerates from rest at a constant rate α for some time, after which it decelerates at a constant rate β and comes to rest. If the total time elapsed is t, then the maximum velocity acquired by the car is

1.  α2+β2αβt
2.  α2β2αβt
3.  (α+β)tαβ
4.  αβtα+β

Subtopic:  Uniformly Accelerated Motion |
 69%
From NCERT
PMT - 1994
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