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A cannon is fired from town \(x\). after how long is the sound heard at a town \(y\), ...

A cannon is fired from town \(x\). after how long is the sound heard at a town \(y\), \(4.95 \mathrm{~km}\) away (velocity of sound in
air \(=330 \mathrm{~ms}^{-1}\) )

A. \(12 \mathrm{~s}\)
B. \(15 \mathrm{~s}\)
C. \(30 \mathrm{~s}\)
D. \(10 \mathrm{~s}\)





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