Case 1
When the blocks start moving together ® A = 10/12 = 5/6
Friction between 2kg and 3kg = 0.2 *2*10
fmax = 4 N
But here 10 = f +2A-----(1)
f = 8.4 N
f > fmax therefore blocks 2kg and 3 kg will move together
A1 = 10 ?4 / 2
= 3 m/s2---------------ans
It is obvious that there will be no relative motion b/w 3 and 7 kg
Hence they will move together A1?= 4/10
= 0.4 m/s2-------ans
CASE 2 and CASE 3
Here all the three blocks will move together
\ A = 10 / 12 = 5/6 m/s2 ------------------ans
Moderation Team
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