A cannon is fired from town X,after how long is the sound heard at a…

A cannon is fired from town X,after how long is the sound heard at a town Y 4.95 km away?
[velocity of sound in the air = 330 ms-1]
  • A.
    30 s
  • B.
    10 s
  • C.
    10 s
  • D.
    15 s
Correct Answer: Option A
Explanation

V = (2X)/t
330 = (2 x 4.95 x 103)/t
t = (9.9. x 103/330 = (9900)/330 = (90)/3
= 30 secs

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