What are 2-3 items in your home and what minerals do they have ?

Newtons view of arrangement of the universe

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?

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.