"""In the arrangement shown in fig., all pulleys are smooth and massless. When the system is released from the  rest, acceleration of block 2 and 3 relative to 1 are `1 ms^(-2)` downwards and `5ms^(-2)` downwards, respectively. Acceleration of block 3 relative to 4 is zero.  <br> <img src=""""https://d10lpgp6xz60nq.cloudfront.net/physics_images/BMS_V01_C06_E01_223_Q01.png"""" width=""""80%""""> <br> Find the absoulte acceleration of block 3."""
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