A string of $7 \;m$ length has a mass of $0.035\,kg$. If tension in the string is $60.5\; N,$ then speed of a wave on the string is .... $m/s$
AIPMT 1989, Easy
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$v = \sqrt {\frac{T}{m}} $ ==> $v = \sqrt {\frac{{60.5}}{{(0.035/7)}}} = 110$ $m/s$
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