Why is tin foil a good sound insulator

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

On a frictionless air track, a blue glider with mass 0.200 kg is moving to the right with a speed of 8.00 m/s. it strikes a red glider that has mass 0.600 kg and that is initially at rest. after the collision, the blue glider is moving to the left with a speed of 3.00 m/s.(a) what are the magnitude and direction of the velocity of the red glider after the collision? (b) is this collision elastic?