Question

A small block b is placed on block a of mass 1 kg and length 20 cm. if initially the block is placed at the right end of block



a. a constant horizontal force of 10 n is applied on the block



a. all the surfaces are assumed frictionless. find the time in which b separates from a

Answer 1

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