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Question

A 60 kg box sledge is travelling horizontally on ice at a speed of $10 m s^{- 1} .$ A 90 kg packet is dropped on it vertically. The subsequent velocity of the sledge is $2 x$ find the value of $x .$

Difficult

Solution

According to LCLM, $60 (10) = (60 + 90) v$ $\Rightarrow v = 4 m / s$

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