Question

Two identical balls are interconnected with a massless and inextensible thread. The system is in gravity free space with the thread just taut. Each ball is imparted a velocity , one towards the other ball and the other perpendicular to the first, at . Then :

This question has multiple correct options
A

the thread will become taut at

B

the thread will become taut at

C

the thread will always remain taut for

D

the kinetic energy of the system will always

Hard

Solution

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Correct options are A) and C)


As shown in figure  and are two identical mass. Suppose move and move because velocity is same. Length taught when  
time taken to travel
thread will taught at and time  
and after that thread always taught because 

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Solve any question of Systems of Particles and Rotational Motion with:-

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As water flows out of the bob the weight of bob decreases.

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