A construction worker’s helmet slips and falls down when he is 78.4 – InterviewSolution

1.	A construction worker’s helmet slips and falls down when he is 78.4 m above the ground. He hears the sound of the helmet hitting the ground 4.23 seconds after it has slipped. Find the speed of sound in air. ( Acceleration due to gravity 9.8m/s2 )
Answer» A construction worker’s helmet slips and falls down when he is $78.4 m$ above the ground. He hears the sound of the helmet hitting the ground $4.23$ seconds after it has slipped. Find the speed of sound in air. ( Acceleration due to gravity $9.8 m / s^{2}$ )

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