A stone is dropped into a lake from a tower 500 meter high. The sound

SOLUTION

We know that

s = ut +1 /2 at²

here u = 0, a = g, s = 500m

so putting value in the above equation

500 = 0 + 5t²
t²=100
t=10 s 

we get t = 10s. this is the time taken for stone to hit the lake.

Now

Velocity of sound in air 332m/s

time of sound travel = t

Distance= sound ×time

500 = 332 × t

t = 1.5 sec

total time = 10+1.5 = 11.5s.