a person throws a ball with an initial speed of 18 m/s at an unknown angle above the horizontal. the ball reaches a maximum height of 13.5 m above the thrower. use the thrower's hand as the origin. a what is the angle that the ball is thrown at? b what are the position and velocity of the ball when it reaches its maximum height? give both in unit vector notation

Ithink it is a. but i'm not 100 percent sure.

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.

Iwould say i also took the quiz but it didn't show me if i got it correct or not.