KinematicsAverage Speed and Instantaneous Velocity (NEET Physics): Questions 100  103 of 108
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Question number: 100
» Kinematics » Average Speed and Instantaneous Velocity
Question
A bullet of mass 0.01 kg travelling at a speed of 500 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.  14 m/s 

b.  1.4 m/s 

c.  220 m/s 

d.  110 m/s 

Question number: 101
» Kinematics » Average Speed and Instantaneous Velocity
Question
A ball of mass m hits a wall with a speed v making an angle 6 with the normal. If the coefficient of restitution is e, the direction and magnitude of the velocity of ball after reflection from the wall will respectively be –
Choices
Choice (4)  Response  

a.  , 

b.  , 

c.  , 

d.  , 

Question number: 102
» 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 40 m/s ^{2} in the vertically upward direction (g = 10 m/s ^{2}), will be –
Choices
Choice (4)  Response  

a.  120 kg/s 

b.  10 kg/s 

c.  60 kg/s 

d.  72 kg/s 

Question number: 103
» 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 600 m/s. What velocity does rifle man acquire at the end of 10 shots.
Choices
Choice (4)  Response  

a.  0.6 m/s 

b.  0.3 m/s 

c.  0.5 m/s 

d.  1.2 m/s 
