KinematicsAverage Speed and Instantaneous Velocity (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 83  87 of 108
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Question number: 83
» Kinematics » Average Speed and Instantaneous Velocity
Question
body of mass 1 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.  0.6 kg 

b.  2.4 kg 

c.  4 kg 

d.  3kg 

Question number: 84
» Kinematics » Average Speed and Instantaneous Velocity
Question
A rifle man, who together with his rifle has a mass of 100 kg, stands on a smooth surface fires 10 shots horizontally. Each bullet has a mass 10 gm and a muzzle velocity of 200 m/s. What velocity does rifle man acquire at the end of 10 shots?
Choices
Choice (4)  Response  

a.  1.2 m/s 

b.  0.5 m/s 

c.  0.6 m/s 

d.  0.2 m/s 

Question number: 85
» Kinematics » Average Speed and Instantaneous Velocity
Question
The rate of burning of fuel in a rocket is 100 gm/sec. and comes out with and velocity 5 x 10 ^{3} m/s. The force exerted by gas on rocket will be –
Choices
Choice (4)  Response  

a.  2.5 x l0 ^{6 } N 

b.  2.5 x l0 ^{4 } N 

c.  500 N 

d.  300 N 

Question number: 86
» Kinematics » Average Speed and Instantaneous Velocity
Question
A bullet of mass 10 g travelling horizontally with a velocity of 600 m/s strikes a
Block of wood of mass 590 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be  (Duration of impact is very short)
Choices
Choice (4)  Response  

a.  ½ 

b.  1/3 

c.  2/3 

d.  ¾ 

Question number: 87
» Kinematics » Average Speed and Instantaneous Velocity
Question
A bullet of mass 10 g travelling horizontally with a velocity of 300 m/s strikes a
block of wood of mass 290 g which rests on a rough horizontal floor. After impact the block and the bullet move together and come to rest when the block has travelled a distance of 15 m. The coefficient of friction between the block and the floor will be  (Duration of impact is very short)
Choices
Choice (4)  Response  

a.  ½ 

b.  2/3 

c.  ¾


d.  1/3 
