A tennis player hits a ball hard and 0.40 s later hears the echo from a wall.The speed of sound in air is 330 m / s.How far away is the player from the wall?
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sound wave travels twice the distance of the wall from player as it had to travel to wall and come back so that the tennis player can hear it. hence vt=2d.... d=330*0.4/2 which gives you A. 66m.
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