This one’s an interesting puzzle and DOES NOT involve any MECHANICS!
There’s a Bridge 2.4 km long with a load handling capacity of exactly 1 tonne and is bound to collapse if load increases by even a single gram than a tonne.
A bus, loaded fully with passengers, of weight exactly a tonne is crossing over the bridge. At exactly 3/4th of the length of the bridge a Crow comes (out of the Blue) and sits on top of the Bus.
But to everyone’s surprise, the Bridge doesn’t collapse and the bus crosses it safely.
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