Ok Iam having problems again with yet something else. The problem states that A physics student with too much free time drops a water melon from the roof of a building. He hears the sound of the watermelon going splat 2.50s later. How high is the building? The speed of sound is 340m/s. You may Ignore air restiance. Well I tried solving this by replacing t by t= 2.5 - (deltaY/340); but the book tells me a completely different answer. Can anyone show me how to do this one?