# Physics

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A rock is dropped from a sea cliff 400m high.If the speed of sound is a constant 330 m/s, how long after the rock is dropped is the sound of the splash heard at the top of the cliff?

• Physics -

break the total sound into two parts:
1) time for the rock to hit the surface.

h=ho-4.9t^2
t= sqrt(400/4.9) check that.

2) time for the sound to go 400m
t= 400/343

check that

• Physics -

^acceleration is 9.8 as well. and wheres 343 from ?

• Physics -

Shut up

• Physics -

i tihnk that's a typo

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