Dear Experts and Friends, Can you please help me solve the given numerical:
Q. A construction worker's helmet slips and falls when he is 78.4 metres above the ground. He hears the sound of  helmet hitting the ground after 4.23 seconds. Find the speed of sound in air if g = 9.8 m/s2.
Thank You !

Dear Student,
                       Time to reach the helmet to the ground =2hg=2×78.49.8=4sso  sound takes (4.23-4)s=.23s to reach construction worker'shence speed of sound =78.4.23=340.86m/s

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Itna esy nhi ata shame on uh.
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I just wanted to cross-check my answer Pratham. 
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