Question

Physics....!
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A man standing 48m away from a wall fires a gun. Calculate the time after which an echo is heard.Speed Of sound in air = 320 m/s
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Answer 1

Distance between the man and wall is 48m(d),

Speed of sound in air is 320m/s,

The total distance covered is 2d =2*48=96m.

Speed = Distance/Time Taken

Time Taken=Distance Travelled/Speed

=96/320sec

=0.3sec

ANS: 0.3 sec.

Answer 2

heya...

Answer:

Velocity = 2 × D/Time Time after which an echo is heard = 2 D/Velocity = 2 × 48 / 320 = 0.3