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?

Question

bobpursley · Answer

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 add the two times.

Angela · Answer

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

Bobalobadingdong · Answer

Shut up

Anonymous · Answer

i tihnk that's a typo