A 73 kg skateboarder on level ground travels at 6.4 m/s towards a ramp. What is the maximum height attained by the skateboarder on the ramp?

Sorry i don’t know what to do

Answer mechanical energy;

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.