Question

A stone is dropped into a well of depth 78.4 m .The impact of stone with water is heard after 4.28s . Find the speed of sound in air (g=9.8m/s^2)

Answer 1

Answer:

height : 78.4m

v=0m/s

u=?

g= 9.8m/s²

T = 4.28 sec

v²-u²=2gh

(0)²-(u)²= 2×9.8×4.28

u²=83.888

u=√83.888

u=9.16 m/s (approx.)

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