At the top of the slide, the boy drops the rubber ball off to the side, so that it falls vertically straight down. Using energy methods, and neglecting air resistance, find the speed of the ball at the bottom of the slide.

Ithink it’s cancer risk

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.