A car is driving at +8 m/s after braking with a constant acceleration of -0.25 m/s^2 for 15 seconds. How fast was the car going before it hit the brakes?

Answerigneous bedrock of the oceanic crust;

Sounds propagates through some kind of medium. usually it's air, but it goes just as well through solid objects like walls, windows etc. a soundwave will compress the (air)molecules in front of it, and if this increased density wave hits your ears, you register it as sound. solid objects like walls are a lot denser than air, this means that they will damp a wave, but also carry it easier.