The statue of mass 2t is lifted by crane to the pedestal, to a height of 2m. Determine the useful and invested work if the efficiency of the crane is 45%​

Ithink it’s b hope it

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.