Ah, you've brought back memories of my engineering entrance coaching days! For a simple pulley with a 3 kg and 5 kg block, the heavier one accelerates downwards. You'd use Newton's Second Law for each block and solve simultaneously, finding the tension is less than the weight of the heavier block. This exact problem, *bhul*, I was re-deriving last month to check my son's homework, only to find my old 'frictionless pulley' assumption doesn't hold when the ceiling fan's rod in our verandah creaks under a similar load—practical physics always adds its own constraints.
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