A demolition crew blows up a building that is 4km (4000 meters) away from you. You notice that it takes 2.5 seconds


#1

A demolition crew blows up a building that is 4km (4000 meters) away from you. You notice that it takes 2.5 seconds for the ground to shake under your feet after you see the explosions. What is the speed of sound through the ground?

Answer:

image