Question

A construction worker's helmet slips and fall when he is 78.4 m above the ground he hears the sound of the helmet hitting the ground after it slipped find the speed of sound in air

Answer 1

Answer:

The helmet 1st goes down.So the sound will take distance.

S =1/2gt^2

78.4=1/2 ×10× t^2

t=3.9 =4 (approx )

d=s × t

78.4 = s × 3.9 =20.1 m/s

or

78.4=s ×4 = 19.6 m/s.

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