A stone is dropped into lake from a tower 500m high. The sound of the splash will be heard by a man on the tiwer after? ( Speed of sound=340m/s)

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Solution

given height,s=500m
g=10
speed of sound =340
on analysing we get that we have to find time period
first analyze the data and apply different formulas for it then see which formula suits the best.
the formula that should be used here is
s=ut+1/2at2
u=0,
500=0+1/2x10xtxt
we get t=10 sec
now the time for the resound=500/340=1.47 sec
total time=10+1.47=11.47 sec

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