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Q)

A uniform string of length 20 m is suspended from a rigid support. A short wave pulse is introduced at its lowest end. It starts moving up the string. The time taken to reach the support is : (take $g = 10\; ms^{−2}$ )


( A ) $2 \; s$
( B ) $2 \pi \sqrt{2} \; s$
( C ) $ \sqrt{2} \; s$
( D ) $2 \sqrt{2} \; s$

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