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At 20°C, a student sets off a firecracker and hears the echo from the Physics building 1.4 seconds later. How far away is thePlease show all work for this exercise

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at t: 20c 2014 ( r) T. 20C 343.21 do vt 4x 343-2 mls 42 0 48 212m distane of of building building a 이 어

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