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Asked in JEE Main 30th Jan 2nd Shift 2024 · Applying the second law and free-body diagrams
Idea: each tension only has to accelerate the blocks behind it, so find the common acceleration first.
Total mass =5+3+2=10 kg, and the 80 N acts on the whole train.
a=(80)/(10)=8 m/s².
T₁ pulls A alone: T₁=5×8=40 N.
T₂ pulls A and B together: T₂=(5+3)×8=64 N.
Check the last block: 80-64=16=2×8, as it must be.
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