In your own words, describe how matter is identified

While goofing off at the ice skating rink, a student takes off her shoes and places each of them on the ice. her friend, a hockey player, then shoots a hockey puck at each shoe. the first puck immediately comes to rest after it collides with the left shoe. the second puck rebounds after it collides with the right shoe. if each hockey puck has the same incoming speed, which shoe has greater speed after the collision? the right shoe. both shoes have the same speed. the left shoe.

The heliocentric and the geocentric models of the solar system included these central principles

Ryan is examining the energy of the particles in a bar of gold. what is ryan most likely studying?