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omkar deepak borkar Grade: 10
        

a small block b is placed on a block a of mass 5kg and lenght 20cm.initially block b is near the right end of block a.


a constant horizontal force of 10newton is applied on block a


all the surfaces are assumed frictionless


find the time elapsed before the block b seperates from block a


 


 


 


 


plz help me

6 years ago

Answers : (1)

vikas askiitian expert
510 Points
										

let the mass of block b is mb....


force on lower block is F=10N....


accleration of system is a...


    (mb+5)a = 10


         a= 10/(mb+5) m/s2


now a seudo force acts on the upper block in opposite direction and its magnitude is f=(mb)a...


 due to this force block moves in opposite direction with accleration a1....


   mba1=mba


      a1=a=10/(5+mb)


when the block covers a distance of 20cm then it separates out...


   0.2 = a1t2/2


   t2  =  (0.4/a1)=[0.04(5+mb)]


   t=  0.2(5+mb)1/2

6 years ago
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