KinematicsAverage Speed and Instantaneous Velocity (NEET Physics): Questions 78  82 of 108
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Question number: 78
» Kinematics » Average Speed and Instantaneous Velocity
Question
In the fig shown, the velocity of each particle at the end of 4 sec will be 
Choices
Choice (4)  Response  

a.  0.218 m/s 

b.  1.744 m/s 

c.  0.872 m/s 

d.  2.18 m/s 

Question number: 79
» Kinematics » Average Speed and Instantaneous Velocity
Question
A body of mass 2 kg strikes elastically with another body at rest and continues to move in the same direction with one fourth of its initial velocity. The mass of the other body is –
Choices
Choice (4)  Response  

a.  4 kg 

b.  0.6 kg 

c.  2.4 kg 

d.  1.2 kg 

Question number: 80
» Kinematics » Average Speed and Instantaneous Velocity
Question
A bullet of mass 0.01 kg travelling at a speed of 200 m/s strikes a block of mass 2 kg, which is suspended by a string of length 5 m. The center of gravity of the block is found to rise a vertical distance of 0.1 m The speed of the bullet after it emerges from the block will be 
Choices
Choice (4)  Response  

a.  1.4 m/s 

b.  220 m/s 

c.  20 m/s 

d.  80 m/s 

Question number: 81
» Kinematics » Average Speed and Instantaneous Velocity
Question
The mass of a rocket is 600 kg and the relative velocity of the gases ejecting from it is 250 m/s with respect to the rocket. The rate of burning of the fuel in order to give the rocket an initial acceleration 20 m/s ^{2} in the vertically upward direction (g = 10 m/s ^{2}), will be –
Choices
Choice (4)  Response  

a.  10 kg/s 

b.  60 kg/s 

c.  72 kg/s 

d.  30 kg/s 

Question number: 82
» Kinematics » Average Speed and Instantaneous Velocity
Question
A 30 g bullet pierces through a plate of mass m _{1} = 1 kg and then comes to rest inside a second plate of mass m _{2} = 1.8 kg. It is found that the two plates, initially at rest, now move with equal velocities. The percentage loss in the initial velocity of bullet when it is between m _{1} and m _{2}. (Neglect any loss of material of the bodies, due to action of bullet. ) will be 
Choices
Choice (4)  Response  

a.  25.67% 

b.  46.45% 

c.  39.525% 

d.  35.33% 
