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  1. Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively :-
    1. g
      , g
      3
    2. g, g
    3. g
      ,
      g
      33
    4. g,
      g
      3
Correct Option: A


Before cutting the string
kx = T + 3 mg ...(i)
T = mg ...(ii)
⇒ kx = 4mg
After cutting the string T = 0

aA =
4mg - 3mg
3m


aA =
g
3

and aB =
mg
= g ↓
m



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