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A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later two sounds are heard from the

A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later two sounds are heard from the impact: one travels in the air and the other in the concrete, and they are 1.1s apart. How far away did the impact occur? See Table 12-1.

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