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19 November, 15:40

A hunter fires a gun and hears an echo from a cliff face 5 s later. He knows the cliff is 850 m away. How fast is the sound travelling where the hunter is

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  1. 19 November, 19:08
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    If the cliff is 850m away, the sound travelled there and back which is 850m * 2 = 1700m

    The sound took 5 seconds to travel 1700m, so it's moving at 1700m/5s = 340 m/s
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