KinematicsAverage Speed and Instantaneous Velocity (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 5  8 of 108
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Question number: 5
» Kinematics » Average Speed and Instantaneous Velocity
Assertion (Ꭺ)
The acceleration of a body of mass 2 kg thrown vertically upwards is always constant.
Reason (Ꭱ)
A body of all mass group travels under constant acceleration when only gravity acts on it.
Choices
Choice (4)  Response  

a.  Ꭺ is false but Ꭱ is true 

b.  Ꭺ is true but Ꭱ is false 

c.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

d.  Both Ꭺ and Ꭱ are false 

Question number: 6
» Kinematics » Average Speed and Instantaneous Velocity
Assertion (Ꭺ)
The magnitude of velocity of two boats relative to river is same. Both boats start simultaneously from same point on the bank may reach opposite bank simultaneously moving along different paths.
Reason (Ꭱ)
For boats to cross the river in same time. The component of their velocity relative to river in direction normal to flow should be same.
Choices
Choice (4)  Response  

a.  Ꭺ is true but Ꭱ is false 

b.  Ꭺ is false but Ꭱ is true 

c.  Both Ꭺ and Ꭱ are false 

d.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 

Question number: 7
» Kinematics » Average Speed and Instantaneous Velocity
Question
the distance between two particles is decreasing at the rate of 6 m/sec. If these particles travel with same speeds and in the same direction, then the separations increase at the rate of 4 m/s. The particles have speeds as
Choices
Choice (4)  Response  

a.  4 m/sec; 1 m/sec 

b.  5 m/sec; 1 m/sec 

c.  4 m/sec; 2 m/sec 

d.  5 m/sec; 2 m/sec 

Question number: 8
» Kinematics » Average Speed and Instantaneous Velocity
Question
Two trains, each 50 m long are travelling in opposite direction with velocity 10 m/s and 15 m/s. The time of crossing is
Choices
Choice (4)  Response  

a. 
2V√3s 

b.  4s 

c. 
4√3s 

d.  Both c. and b. are correct 
