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A stone is dropped into a deep shaft without any initial velocity. The sound of the stone hitting the bottom is heard after 4 seconds. If the velocity of sound is 330 m/sec the depth of the shaft will be

[A].	660 m	[B].	330 m
[C].	165 m	[D].	66.2 m
[E].	33.1 m

Answer: Option D

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