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Dear jauneet
surface is friction less so no horizontal force will act on the 5 kg block. it will remain at rest.
acceleration of the 20 kg block = F/m = 15/20 = 3/4
time taken by 20 kg block to travel 25 cm distance is
S= 1/2 at2
t= (2S/a)1/2
= (2*.25/3/4)1/2
= (2/3)1/2 sec
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