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Question: Answered & Verified by Expert
The system shown in the figure is in equilibrium and all the blocks are at rest. Assume that the masses of the strings, the pulley and the spring are negligible with respect to the masses of the blocks and friction is absent. Find the acceleration of block C, just after cutting the string 1. [g=10 m s-2]

PhysicsLaws of MotionJEE Main
Options:
  • A 5 ms-2
  • B 3 ms-2
  • C 2 ms-2
  • D 6 ms-2
Solution:
2036 Upvotes Verified Answer
The correct answer is: 5 ms-2
Just after cutting the string 1 the extension of the string will remain same as it was before cutting the string '1'. So, we can take string force on block is equal '2g'.

Now making F.B.D of block 'B'.

3g-T=1a .... (i)



Making F.B.D of block 'c'



T=5a .... (ii)

From (i) and (ii)

a=g2=5 m s-2

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