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Grade 12Mechanics

please. Send me solution for the above problem i have did so many times but not getting any one can help me

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Profile image of SIVA DVV
7 Years agoGrade 12
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1 Answer

Profile image of Arun
7 Years ago
 

velocity of A is v along AB 

the velocity of B is along BC . its component along BA is vcos60 = v/2. thus the separation AB decreases at the rate

 

v+v/2=3v/2

sice this rate is constt. the time taken in reducing the separation AB from l to 0 is 

 

t=l/(3v/2) =2l/3v