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A boy plants a bomb at a place and starts running at 36 m/sec. After 43 sec, the bomb was blast. In how much time the sound of blast will be listen be listen by the boy if speed of sound is 552 m/sec?

A boy plants a bomb at a place and starts running at 36 m/sec. After 43 sec, the bomb was blast. In how much time the sound of blast will be listen be listen by the boy if speed of sound is 552 m/sec? Correct Answer 3 sec

Given:

A boy plants a bomb at a place and starts running at 36 m/sec. 

After the 43-sec bomb blast

Calculation:

Boys distance in 43 sec = 43 × 36 m

Relative speed of sound and boy = 552 - 36 = 516 m/sec

time taken= 43 × 36/516 = 3 sec

 

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