Question

a tennis player hits a ball hard and 0.4s later he heard the echo from a wall.
the speed of sound in air is 330m/s. how far is the player from the ball​

Answer 1

Answer:

let x be the distance from the wall.v*t=d.but the 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.