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 0.45 s apart. The speed of sound in air is 343 m/s, and in concrete is 3000 m/s.
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A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later...
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