In an investigation, Nachiket drops a basketball from a ladder and watches it fall to the ground. What is the force that pulls the basketball to the ground? *

Electoral current force mechanical advantage if the wheel and axle is 2 n and the output force is 20 n

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.