Two bodies are thrown simultaneously from a tower with same initial velocity v0 : one vertically upwards, the other vertically downwards. The distance between the two bodies after time t is

(1) 2v0t+12gt2

(2) 2v0t

(3) v0t+12gt2

(4) v0t

Subtopic:  Relative Motion in One Dimension |
 63%
From NCERT
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A body falls freely from the top of a tower. It covers 36% of the total height in the last second before striking the ground level. The height of the tower is:

(1) 50 m

(2) 75 m

(3) 100 m

(4) 125 m

Subtopic:  Uniformly Accelerated Motion |
 63%
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 (t1+t2)

4. g(t1+t2)2

Subtopic:  Uniformly Accelerated Motion |
 69%
From NCERT
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A projectile is fired vertically upwards with an initial velocity u. After an interval of T seconds a second projectile is fired vertically upwards, also with initial velocity u.

(1) They meet at time t=ug and at a height u22g+gT28

(2) They meet at time t=ug+T2 and at a height u22g+gT28

(3) They meet at time t=ug+T2 and at a height u22ggT28

(4) They never meet

Subtopic:  Uniformly Accelerated Motion | Relative Motion in One Dimension |
From NCERT
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Two cars are moving in the same direction with the same speed 30 km/hr. They are separated by a distance of 5 km. The speed of a car moving in the opposite direction, if it meets these two cars at an interval of 4 minutes, will be

1. 40 km/hr

2. 45 km/hr

3. 30 km/hr

4. 15 km/hr

Subtopic:  Relative Motion in One Dimension |
 73%
From NCERT
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A 150 m long train is moving to north at a speed of 10 m/s. A parrot flying towards south with a speed of 5 m/s crosses the train. The time taken by the parrot the cross to train would be: 

(1) 30 s

(2) 15 s

(3) 8 s

(4) 10 s

Subtopic:  Relative Motion in One Dimension |
 83%
From NCERT
PMT - 1992
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A moves with 65 km/h while B is coming back of A with 80 km/h. The relative velocity of B with respect to A is 

1. 80 km/h

2. 60 km/h

3. 15 km/h

4.145 km/h

Subtopic:  Relative Motion in One Dimension |
From NCERT
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Two trains along the same straight rails moving with constant speed 60 km/hr and 30 km/hr respectively towards each other. If at time t = 0, the distance between them is 90 km, the time when they collide is:

1. 1 hr

2. 2 hr

3. 3 hr

4. 4 hr

Subtopic:  Relative Motion in One Dimension |
 79%
From NCERT
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A bus is moving with a velocity 10 m/s on a straight road. A scooterist wishes to overtake the bus in 100 s. If the bus is at a distance of 1 km from the scooterist, with what velocity should the scooterist chase the bus

(1) 50 m/s

(2) 40 m/s

(3) 30 m/s

(4) 20 m/s

Subtopic:  Relative Motion in One Dimension |
 86%
From NCERT
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An automobile travelling with a speed of 60 km/h, can brake to stop within a distance of 20 m. If the car is going twice as fast, i.e. 120 km/h, the stopping distance will be 

(1) 20 m

(2) 40 m

(3) 60 m

(4) 80 m

Subtopic:  Uniformly Accelerated Motion |
 79%
From NCERT
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