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A block of mass 2 kg is suspended from a string, is released from a height of 5 m as shown in figure then what will be the impulse when string. Just becomes tight :

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0.2 N s

2 Ns

200 N s

20 N s

answer is C.

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Detailed Solution

$\begin{array}{l} I = ΔP = m (v - u) = 2 (\sqrt{2 gh} - 0) \\ = 2 \sqrt{2 \times 10 \times 5} \\ = 20 Ns \end{array}$

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